feat: Added Antenna selection to Flex FlexPanel

feat: New settings flexradio to select antennas per band

app.go

@@ -7426,6 +7426,83 @@ func (a *App) FlexSetMute(on bool) error {
 	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetMute(on) })
 }
 
+func (a *App) FlexSetRXAntenna(ant string) error {
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetRXAntenna(ant) })
+}
+
+func (a *App) FlexSetTXAntenna(ant string) error {
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetTXAntenna(ant) })
+}
+
+// keyFlexBandAnt stores the per-band RX/TX antenna map (global, machine-local).
+const keyFlexBandAnt = "flex.band_antennas"
+
+// FlexBandAnt is the antenna pair to select on a given band.
+type FlexBandAnt struct {
+	RX string `json:"rx"`
+	TX string `json:"tx"`
+}
+
+// GetFlexBandAntennas returns the band→{rx,tx} antenna map (band key uppercased,
+// e.g. "20M").
+func (a *App) GetFlexBandAntennas() (map[string]FlexBandAnt, error) {
+	out := map[string]FlexBandAnt{}
+	if a.settings == nil {
+		return out, nil
+	}
+	v, _ := a.settings.GetGlobal(a.ctx, keyFlexBandAnt)
+	if strings.TrimSpace(v) == "" {
+		return out, nil
+	}
+	_ = json.Unmarshal([]byte(v), &out)
+	return out, nil
+}
+
+// SaveFlexBandAntennas persists the band→antenna map.
+func (a *App) SaveFlexBandAntennas(m map[string]FlexBandAnt) error {
+	if a.settings == nil {
+		return fmt.Errorf("db not initialized")
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+	return a.settings.SetGlobal(a.ctx, keyFlexBandAnt, string(b))
+}
+
+// FlexApplyBandAntenna selects the configured RX/TX antennas for the given band
+// (no-op if the backend isn't a Flex or the band has no mapping). Called on band
+// changes and spot clicks so the right antennas follow the frequency.
+func (a *App) FlexApplyBandAntenna(band string) error {
+	if a.cat == nil {
+		return nil
+	}
+	band = strings.ToUpper(strings.TrimSpace(band))
+	if band == "" {
+		return nil
+	}
+	m, _ := a.GetFlexBandAntennas()
+	ant, ok := m[band]
+	if !ok {
+		return nil
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error {
+		if strings.TrimSpace(ant.RX) != "" {
+			_ = fc.SetRXAntenna(ant.RX)
+		}
+		if strings.TrimSpace(ant.TX) != "" {
+			_ = fc.SetTXAntenna(ant.TX)
+		}
+		return nil
+	})
+}
+
 func (a *App) FlexSetNB(on bool) error {
 	if a.cat == nil {
 		return fmt.Errorf("cat not initialized")

frontend/src/App.tsx

@@ -13,7 +13,7 @@ import {
   GetStartupStatus, CheckForUpdate,
   WorkedBefore,
   SetCompactMode,
-  GetCATState, SetCATFrequency, SetCATMode, SwitchCATRig,
+  GetCATState, SetCATFrequency, SetCATMode, SwitchCATRig, FlexApplyBandAntenna,
   GetSecretStatus, UnlockSecrets,
   RefreshCtyDat, DownloadAllReferenceLists,
   RotatorGoTo, RotatorStop, GetRotatorHeading,
@@ -1431,6 +1431,19 @@ export default function App() {
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
+  // FlexRadio: apply the per-band RX/TX antennas whenever the band changes (rig
+  // QSY, spot click, manual band) — so the right antennas follow the frequency.
+  // Skipped while the band is LOCKED (entering an old QSO off-air) and for non-Flex
+  // backends. The backend no-ops if the band has no configured mapping.
+  const lastAntBandRef = useRef('');
+  useEffect(() => {
+    if (catState.backend !== 'flex' || locks.band) return;
+    const b = band.trim();
+    if (!b || b === lastAntBandRef.current) return;
+    lastAntBandRef.current = b;
+    FlexApplyBandAntenna(b).catch(() => {});
+  }, [band, catState.backend, locks.band]);
+
   // Cluster live wiring: hydrate per-server status + saved server list,
   // then subscribe to push events.
   async function reloadClusterMeta() {

frontend/src/components/FlexPanel.tsx

@@ -5,7 +5,7 @@ import {
   FlexSetProcessor, FlexSetProcessorLevel, FlexSetMon, FlexSetMonLevel, FlexSetMic,
   FlexMox, FlexAmpOperate,
   GetPGXLStatus, PGXLSetFanMode,
-  FlexSetAGCMode, FlexSetAGCThreshold, FlexSetAudioLevel, FlexSetMute,
+  FlexSetAGCMode, FlexSetAGCThreshold, FlexSetAudioLevel, FlexSetMute, FlexSetRXAntenna, FlexSetTXAntenna,
   FlexSetNB, FlexSetNBLevel, FlexSetNR, FlexSetNRLevel, FlexSetANF, FlexSetANFLevel,
   FlexSetAPF, FlexSetAPFLevel, FlexSetCWSpeed, FlexSetCWPitch, FlexSetCWBreakInDelay,
   FlexSetCWSidetone, FlexSetSidetoneLevel, FlexSetCWFilter, FlexSetFilter,
@@ -20,6 +20,7 @@ type FlexState = {
   mon: boolean; mon_level: number; mic_level: number;
   atu_status?: string; atu_memories: boolean;
   rx_avail: boolean; agc_mode?: string; agc_threshold: number; audio_level: number; mute: boolean;
+  rx_ant?: string; tx_ant?: string; ant_list?: string[]; tx_ant_list?: string[];
   nb: boolean; nb_level: number; nr: boolean; nr_level: number; anf: boolean; anf_level: number;
   mode?: string;
   cw_speed: number; cw_pitch: number; cw_break_in_delay: number; cw_sidetone: boolean; cw_mon_level: number;
@@ -357,6 +358,25 @@ export function FlexPanel() {
 
           {/* RECEIVE */}
           <Card icon={AudioLines} title="Receive (active slice)" accent="#0891b2">
+            {((st.ant_list?.length ?? 0) > 0 || (st.tx_ant_list?.length ?? 0) > 0) && (
+              <div className="flex items-center gap-2">
+                <span className="w-14 shrink-0 text-[11px] font-bold text-muted-foreground">Ant</span>
+                <div className="flex items-center gap-1.5 flex-1 min-w-0">
+                  <span className="text-[10px] text-muted-foreground">RX</span>
+                  <select disabled={rxOff} value={st.rx_ant ?? ''}
+                    onChange={(e) => change('rx_ant', e.target.value, () => FlexSetRXAntenna(e.target.value))}
+                    className="h-7 flex-1 min-w-0 rounded-md border border-input bg-background px-1.5 text-xs font-mono disabled:opacity-40">
+                    {(st.ant_list ?? []).map((a) => <option key={a} value={a}>{a}</option>)}
+                  </select>
+                  <span className="text-[10px] text-muted-foreground">TX</span>
+                  <select disabled={rxOff} value={st.tx_ant ?? ''}
+                    onChange={(e) => change('tx_ant', e.target.value, () => FlexSetTXAntenna(e.target.value))}
+                    className="h-7 flex-1 min-w-0 rounded-md border border-input bg-background px-1.5 text-xs font-mono disabled:opacity-40">
+                    {((st.tx_ant_list?.length ? st.tx_ant_list : st.ant_list) ?? []).map((a) => <option key={a} value={a}>{a}</option>)}
+                  </select>
+                </div>
+              </div>
+            )}
             <div className="flex items-center gap-2">
               <span className="w-14 shrink-0 text-[11px] font-bold text-muted-foreground">AGC</span>
               <Segmented value={(st.agc_mode || 'med').toLowerCase()} options={AGC} disabled={rxOff}

frontend/src/components/MainMap.tsx

@@ -164,15 +164,16 @@ export function WorldMap({ fromGrid, toGrid, fromLabel, toLabel, beamAzimuths, b
           return out;
         };
         for (const az of beamAzimuths) {
-          // Draw the lobe as a single FILLED shape that HUGS the great-circle
+          // Draw the lobe as a DENSE fan of translucent great-circle radials, not
-          // curve: bound it by the two edge radials (az ± half-beamwidth), each a
+          // a filled polygon: a polygon smears badly near the poles on Mercator
-          // great-circle line, joined by a short far cap. Filling between the two
+          // (a poleward beam degenerates into a giant triangle), while each radial
-          // curved edges follows the arc instead of making a straight triangle.
+          // LINE stays clean at any azimuth. A small angular step makes the lines
-          const edgeL = radial(az - half);
+          // overlap into a solid-looking lobe (no separate strokes), darker near
-          const edgeR = radial(az + half);
+          // the antenna and fanning out toward the front.
-          const lobe = [[from.lat, from.lon], ...edgeL, ...edgeR.slice().reverse()] as [number, number][];
+          for (let b = az - half; b <= az + half + 0.001; b += 0.5) {
-          L.polygon(unwrapLon(lobe) as L.LatLngExpression[],
+            const line = unwrapLon([[from.lat, from.lon], ...radial(b)]);
-            { stroke: false, fillColor: '#ff2d2d', fillOpacity: 0.18, smoothFactor: 0 }).addTo(wo);
+            L.polyline(line as L.LatLngExpression[], { color: '#ff2d2d', weight: 6, opacity: 0.10, smoothFactor: 0 }).addTo(wo);
+          }
 
           const cl = unwrapLon([[from.lat, from.lon], ...radial(az)]);
           // Dark casing under the boresight so the bright dashed line stays

frontend/src/components/SettingsModal.tsx

@@ -38,6 +38,7 @@ import {
   TestLoTWUpload, ListTQSLStationLocations,
   ComputeStationInfo,
   GetUIPref, SetUIPref,
+  GetFlexState, GetFlexBandAntennas, SaveFlexBandAntennas,
 } from '../../wailsjs/go/main/App';
 import type { profile as profileModels } from '../../wailsjs/go/models';
 import type { LookupSettingsForm, StationSettingsForm, ListsSettingsForm, ModePresetForm } from '@/types';
@@ -174,13 +175,27 @@ type SectionId =
   | 'antenna'
   | 'antgenius'
   | 'pgxl'
+  | 'flex'
   | 'audio';
 
 type TreeNode =
   | { kind: 'group'; label: string; icon?: any; defaultOpen?: boolean; children: TreeNode[] }
   | { kind: 'item';  label: string; id: SectionId; disabled?: boolean };
 
-const TREE: TreeNode[] = [
+// buildTree returns the settings sidebar. The FlexRadio item only appears when
+// the active CAT backend is a Flex (per-band antenna config is Flex-specific).
+function buildTree(flexAvailable: boolean): TreeNode[] {
+  const hardware: TreeNode[] = [
+    { kind: 'item', label: 'CAT interface',          id: 'cat' },
+    { kind: 'item', label: 'PstRotator',            id: 'rotator' },
+    { kind: 'item', label: 'CW Keyer',             id: 'winkeyer' },
+    { kind: 'item', label: 'UltraBeam',             id: 'antenna' },
+    { kind: 'item', label: 'Antenna Genius',      id: 'antgenius' },
+    { kind: 'item', label: 'Power Genius',         id: 'pgxl' },
+    ...(flexAvailable ? [{ kind: 'item', label: 'FlexRadio', id: 'flex' } as TreeNode] : []),
+    { kind: 'item', label: 'Audio devices',     id: 'audio' },
+  ];
+  return [
   {
     kind: 'group', label: 'User Configuration', icon: User, defaultOpen: true, children: [
       { kind: 'item', label: 'Station Information', id: 'station' },
@@ -206,17 +221,10 @@ const TREE: TreeNode[] = [
     ],
   },
   {
-    kind: 'group', label: 'Hardware Configuration', icon: Server, defaultOpen: true, children: [
+    kind: 'group', label: 'Hardware Configuration', icon: Server, defaultOpen: true, children: hardware,
-      { kind: 'item', label: 'CAT interface',          id: 'cat' },
-      { kind: 'item', label: 'PstRotator',            id: 'rotator' },
-      { kind: 'item', label: 'CW Keyer',             id: 'winkeyer' },
-      { kind: 'item', label: 'UltraBeam',             id: 'antenna' },
-      { kind: 'item', label: 'Antenna Genius',      id: 'antgenius' },
-      { kind: 'item', label: 'Power Genius',         id: 'pgxl' },
-      { kind: 'item', label: 'Audio devices',     id: 'audio' },
-    ],
   },
   ];
+}
 
 // Map section id → friendly name (used in breadcrumb / placeholders).
 const SECTION_LABELS: Partial<Record<SectionId, string>> = {
@@ -240,6 +248,7 @@ const SECTION_LABELS: Partial<Record<SectionId, string>> = {
   antenna: 'UltraBeam',
   antgenius: 'Antenna Genius',
   pgxl: 'Power Genius',
+  flex: 'FlexRadio',
   audio: 'Audio devices',
 };
 
@@ -248,12 +257,13 @@ const SECTION_LABELS: Partial<Record<SectionId, string>> = {
 interface TreeProps {
   selected: SectionId;
   onSelect: (id: SectionId) => void;
+  flexAvailable?: boolean;
 }
 
-function Tree({ selected, onSelect }: TreeProps) {
+function Tree({ selected, onSelect, flexAvailable }: TreeProps) {
   return (
     <nav className="text-sm">
-      {TREE.map((node, i) => (
+      {buildTree(!!flexAvailable).map((node, i) => (
         <TreeNodeView key={i} node={node} depth={0} selected={selected} onSelect={onSelect} />
       ))}
     </nav>
@@ -585,6 +595,90 @@ function ComingSoon({ id, icon: Icon }: { id: SectionId; icon?: any }) {
   );
 }
 
+// FlexBandAntennasPanel — pick the RX/TX antenna per band. Applied automatically
+// when the band changes (frequency change / spot click). Antennas come live from
+// the connected FlexRadio; bands come from Lists → Bands.
+function FlexBandAntennasPanel({ bands }: { bands: string[] }) {
+  const [rxList, setRxList] = useState<string[]>([]);
+  const [txList, setTxList] = useState<string[]>([]);
+  const [map, setMap] = useState<Record<string, { rx: string; tx: string }>>({});
+  const [msg, setMsg] = useState('');
+  useEffect(() => {
+    GetFlexState().then((s: any) => {
+      setRxList((s?.ant_list ?? []) as string[]);
+      setTxList(((s?.tx_ant_list?.length ? s.tx_ant_list : s?.ant_list) ?? []) as string[]);
+    }).catch(() => {});
+    GetFlexBandAntennas().then((m: any) => setMap(m ?? {})).catch(() => {});
+  }, []);
+  const set = (band: string, side: 'rx' | 'tx', v: string) => {
+    const key = band.toUpperCase();
+    setMap((m) => {
+      const cur = m[key] ?? { rx: '', tx: '' };
+      const next = { ...m, [key]: { ...cur, [side]: v } };
+      SaveFlexBandAntennas(next as any)
+        .then(() => { setMsg('Saved'); window.setTimeout(() => setMsg(''), 1200); })
+        .catch((e: any) => setMsg(String(e?.message ?? e)));
+      return next;
+    });
+  };
+  return (
+    <div className="space-y-3">
+      <div>
+        <h3 className="text-base font-semibold text-foreground">FlexRadio — per-band antennas</h3>
+        <p className="text-xs text-muted-foreground">
+          Choose the RX and TX antenna for each band. They're applied automatically when the band
+          changes (frequency change or clicking a spot).
+        </p>
+      </div>
+      {rxList.length === 0 && (
+        <div className="text-xs text-amber-700 bg-amber-50 border border-amber-200 rounded-md px-3 py-2 max-w-xl">
+          No antennas reported yet — make sure the FlexRadio is connected (CAT interface), then reopen this panel.
+        </div>
+      )}
+      {bands.length === 0 ? (
+        <p className="text-xs text-muted-foreground">No bands configured — add them in Lists → Bands.</p>
+      ) : (
+        <div className="rounded-md border border-border overflow-hidden max-w-xl">
+          <table className="w-full text-sm">
+            <thead className="bg-muted/40 text-muted-foreground text-xs">
+              <tr>
+                <th className="text-left px-3 py-1.5 font-semibold">Band</th>
+                <th className="text-left px-3 py-1.5 font-semibold">RX antenna</th>
+                <th className="text-left px-3 py-1.5 font-semibold">TX antenna</th>
+              </tr>
+            </thead>
+            <tbody>
+              {bands.map((b) => {
+                const e = map[b.toUpperCase()] ?? { rx: '', tx: '' };
+                return (
+                  <tr key={b} className="border-t border-border/50">
+                    <td className="px-3 py-1.5 font-mono font-semibold">{b}</td>
+                    <td className="px-3 py-1.5">
+                      <select value={e.rx ?? ''} onChange={(ev) => set(b, 'rx', ev.target.value)}
+                        className="h-8 w-32 rounded-md border border-input bg-background px-1.5 text-xs font-mono">
+                        <option value="">— none —</option>
+                        {rxList.map((a) => <option key={a} value={a}>{a}</option>)}
+                      </select>
+                    </td>
+                    <td className="px-3 py-1.5">
+                      <select value={e.tx ?? ''} onChange={(ev) => set(b, 'tx', ev.target.value)}
+                        className="h-8 w-32 rounded-md border border-input bg-background px-1.5 text-xs font-mono">
+                        <option value="">— none —</option>
+                        {txList.map((a) => <option key={a} value={a}>{a}</option>)}
+                      </select>
+                    </td>
+                  </tr>
+                );
+              })}
+            </tbody>
+          </table>
+        </div>
+      )}
+      {msg && <span className="text-[11px] text-muted-foreground">{msg}</span>}
+    </div>
+  );
+}
+
 export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChanged, flexAvailable }: Props) {
   const [selected, setSelected] = useState<SectionId>((initialSection as SectionId) || 'station');
   const [loading, setLoading] = useState(true);
@@ -3848,6 +3942,7 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
     antenna:        UltrabeamPanel,
     antgenius:      AntGeniusPanelSettings,
     pgxl:           PGXLPanelSettings,
+    flex:           () => <FlexBandAntennasPanel bands={lists.bands ?? []} />,
     audio:          AudioPanel,
   };
 
@@ -3865,7 +3960,7 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
           <div className="grid grid-cols-[320px_1fr] min-h-0 overflow-hidden">
             {/* Left sidebar tree */}
             <aside className="border-r border-border bg-muted/30 overflow-y-auto p-2">
-              <Tree selected={selected} onSelect={setSelected} />
+              <Tree selected={selected} onSelect={setSelected} flexAvailable={flexAvailable} />
             </aside>
 
             {/* Right content pane */}

frontend/wailsjs/go/main/App.d.ts

@@ -138,6 +138,8 @@ export function FlexATUStart():Promise<void>;
 
 export function FlexAmpOperate(arg1:boolean):Promise<void>;
 
+export function FlexApplyBandAntenna(arg1:string):Promise<void>;
+
 export function FlexMox(arg1:boolean):Promise<void>;
 
 export function FlexSetAGCMode(arg1:string):Promise<void>;
@@ -190,8 +192,12 @@ export function FlexSetProcessor(arg1:boolean):Promise<void>;
 
 export function FlexSetProcessorLevel(arg1:number):Promise<void>;
 
+export function FlexSetRXAntenna(arg1:string):Promise<void>;
+
 export function FlexSetSidetoneLevel(arg1:number):Promise<void>;
 
+export function FlexSetTXAntenna(arg1:string):Promise<void>;
+
 export function FlexSetTunePower(arg1:number):Promise<void>;
 
 export function FlexSetVox(arg1:boolean):Promise<void>;
@@ -258,6 +264,8 @@ export function GetEmailSettings():Promise<main.EmailSettings>;
 
 export function GetExternalServices():Promise<extsvc.ExternalServices>;
 
+export function GetFlexBandAntennas():Promise<Record<string, main.FlexBandAnt>>;
+
 export function GetFlexState():Promise<cat.FlexTXState>;
 
 export function GetIcomState():Promise<cat.IcomTXState>;
@@ -522,6 +530,8 @@ export function SaveEmailSettings(arg1:main.EmailSettings):Promise<void>;
 
 export function SaveExternalServices(arg1:extsvc.ExternalServices):Promise<void>;
 
+export function SaveFlexBandAntennas(arg1:Record<string, main.FlexBandAnt>):Promise<void>;
+
 export function SaveListsSettings(arg1:main.ListsSettings):Promise<void>;
 
 export function SaveLookupSettings(arg1:main.LookupSettings):Promise<void>;

frontend/wailsjs/go/main/App.js

@@ -242,6 +242,10 @@ export function FlexAmpOperate(arg1) {
   return window['go']['main']['App']['FlexAmpOperate'](arg1);
 }
 
+export function FlexApplyBandAntenna(arg1) {
+  return window['go']['main']['App']['FlexApplyBandAntenna'](arg1);
+}
+
 export function FlexMox(arg1) {
   return window['go']['main']['App']['FlexMox'](arg1);
 }
@@ -346,10 +350,18 @@ export function FlexSetProcessorLevel(arg1) {
   return window['go']['main']['App']['FlexSetProcessorLevel'](arg1);
 }
 
+export function FlexSetRXAntenna(arg1) {
+  return window['go']['main']['App']['FlexSetRXAntenna'](arg1);
+}
+
 export function FlexSetSidetoneLevel(arg1) {
   return window['go']['main']['App']['FlexSetSidetoneLevel'](arg1);
 }
 
+export function FlexSetTXAntenna(arg1) {
+  return window['go']['main']['App']['FlexSetTXAntenna'](arg1);
+}
+
 export function FlexSetTunePower(arg1) {
   return window['go']['main']['App']['FlexSetTunePower'](arg1);
 }
@@ -482,6 +494,10 @@ export function GetExternalServices() {
   return window['go']['main']['App']['GetExternalServices']();
 }
 
+export function GetFlexBandAntennas() {
+  return window['go']['main']['App']['GetFlexBandAntennas']();
+}
+
 export function GetFlexState() {
   return window['go']['main']['App']['GetFlexState']();
 }
@@ -1010,6 +1026,10 @@ export function SaveExternalServices(arg1) {
   return window['go']['main']['App']['SaveExternalServices'](arg1);
 }
 
+export function SaveFlexBandAntennas(arg1) {
+  return window['go']['main']['App']['SaveFlexBandAntennas'](arg1);
+}
+
 export function SaveListsSettings(arg1) {
   return window['go']['main']['App']['SaveListsSettings'](arg1);
 }

frontend/wailsjs/go/models.ts

@@ -516,6 +516,10 @@ export namespace cat {
 	    agc_threshold: number;
 	    audio_level: number;
 	    mute: boolean;
+	    rx_ant?: string;
+	    tx_ant?: string;
+	    ant_list?: string[];
+	    tx_ant_list?: string[];
 	    nb: boolean;
 	    nb_level: number;
 	    nr: boolean;
@@ -565,6 +569,10 @@ export namespace cat {
 	        this.agc_threshold = source["agc_threshold"];
 	        this.audio_level = source["audio_level"];
 	        this.mute = source["mute"];
+	        this.rx_ant = source["rx_ant"];
+	        this.tx_ant = source["tx_ant"];
+	        this.ant_list = source["ant_list"];
+	        this.tx_ant_list = source["tx_ant_list"];
 	        this.nb = source["nb"];
 	        this.nb_level = source["nb_level"];
 	        this.nr = source["nr"];

internal/cat/cat.go

@@ -252,6 +252,10 @@ type FlexTXState struct {
 	AGCThreshold int      `json:"agc_threshold"`
 	AudioLevel   int      `json:"audio_level"`
 	Mute         bool     `json:"mute"`
+	RXAnt        string   `json:"rx_ant,omitempty"`      // selected RX antenna
+	TXAnt        string   `json:"tx_ant,omitempty"`      // selected TX antenna
+	AntList      []string `json:"ant_list,omitempty"`    // antennas selectable for RX
+	TXAntList    []string `json:"tx_ant_list,omitempty"` // antennas selectable for TX
 	NB           bool     `json:"nb"`
 	NBLevel      int      `json:"nb_level"`
 	NR           bool     `json:"nr"`
@@ -314,6 +318,8 @@ type FlexController interface {
 	SetAGCThreshold(int) error
 	SetAudioLevel(int) error
 	SetMute(bool) error
+	SetRXAntenna(string) error
+	SetTXAntenna(string) error
 	SetNB(bool) error
 	SetNBLevel(int) error
 	SetNR(bool) error

internal/cat/flex.go

@@ -84,6 +84,10 @@ type flexSlice struct {
 	apfLevel     int
 	filterLo     int      // slice filter low cut (Hz)
 	filterHi     int      // slice filter high cut (Hz)
+	rxAnt        string   // selected RX antenna (e.g. ANT1, ANT2, RX_A)
+	txAnt        string   // selected TX antenna
+	antList      []string // antennas valid for this slice (RX side)
+	txAntList    []string // antennas valid for TX
 }
 
 // flexTX mirrors the radio's transmit/ATU/interlock objects (the SmartSDR-style
@@ -673,6 +677,14 @@ func (f *Flex) handleStatus(payload string) {
 			s.audioLevel = atoiDefault(val, s.audioLevel)
 		case "audio_mute", "mute":
 			s.mute = val == "1"
+		case "rxant":
+			s.rxAnt = val
+		case "txant":
+			s.txAnt = val
+		case "ant_list":
+			s.antList = splitCSV(val)
+		case "tx_ant_list":
+			s.txAntList = splitCSV(val)
 		case "nb":
 			s.nb = val == "1"
 		case "nb_level":
@@ -960,6 +972,18 @@ func splitKV(kv string) (key, val string, ok bool) {
 }
 
 // atoiDefault parses an int (or a float like "20.0", truncated), else def.
+// splitCSV splits a comma-separated antenna list (e.g. "ANT1,ANT2,RX_A") into a
+// trimmed slice, dropping empties.
+func splitCSV(s string) []string {
+	out := []string{}
+	for _, p := range strings.Split(s, ",") {
+		if p = strings.TrimSpace(p); p != "" {
+			out = append(out, p)
+		}
+	}
+	return out
+}
+
 func atoiDefault(s string, def int) int {
 	s = strings.TrimSpace(s)
 	if n, err := strconv.Atoi(s); err == nil {
@@ -1043,6 +1067,13 @@ func (f *Flex) FlexState() FlexTXState {
 		st.APFLevel = rx.apfLevel
 		st.FilterLo = rx.filterLo
 		st.FilterHi = rx.filterHi
+		st.RXAnt = rx.rxAnt
+		st.TXAnt = rx.txAnt
+		st.AntList = rx.antList
+		st.TXAntList = rx.txAntList
+		if len(st.TXAntList) == 0 {
+			st.TXAntList = rx.antList // many configs share one antenna list
+		}
 	}
 	if f.amp.handle != "" {
 		st.AmpAvailable = true
@@ -1098,6 +1129,10 @@ func (f *Flex) sendSlice(param string, val any) error {
 			rx.apf = val == "1"
 		case "apf_level":
 			rx.apfLevel = toInt(val)
+		case "rxant":
+			rx.rxAnt = fmt.Sprint(val)
+		case "txant":
+			rx.txAnt = fmt.Sprint(val)
 		}
 	}
 	f.mu.Unlock()
@@ -1133,6 +1168,8 @@ func (f *Flex) SetAGCMode(m string) error {
 func (f *Flex) SetAGCThreshold(l int) error { return f.sendSlice("agc_threshold", clampLevel(l)) }
 func (f *Flex) SetAudioLevel(l int) error   { return f.sendSlice("audio_level", clampLevel(l)) }
 func (f *Flex) SetMute(on bool) error       { return f.sendSlice("audio_mute", boolFlex(on)) }
+func (f *Flex) SetRXAntenna(a string) error { return f.sendSlice("rxant", a) }
+func (f *Flex) SetTXAntenna(a string) error { return f.sendSlice("txant", a) }
 func (f *Flex) SetNB(on bool) error         { return f.sendSlice("nb", boolFlex(on)) }
 func (f *Flex) SetNBLevel(l int) error      { return f.sendSlice("nb_level", clampLevel(l)) }
 func (f *Flex) SetNR(on bool) error         { return f.sendSlice("nr", boolFlex(on)) }