diff --git a/frontend/src/components/AntGeniusPanel.tsx b/frontend/src/components/AntGeniusPanel.tsx
index 203b8f0..e0f6fbe 100644
--- a/frontend/src/components/AntGeniusPanel.tsx
+++ b/frontend/src/components/AntGeniusPanel.tsx
@@ -33,6 +33,37 @@ function pretty(name: string): string {
   return t.charAt(0).toUpperCase() + t.slice(1).toLowerCase();
 }
 
+// PortBtn is defined at MODULE scope on purpose. Defined inside AntGeniusPanel it
+// would be a new component *type* on every render, so React would unmount and
+// remount every port button each time the panel re-renders — harmless when that's
+// rare, but with the CW decoder running the parent re-renders many times a second
+// and the buttons were being torn down mid-click (mousedown and mouseup landing on
+// different element instances), so antenna changes silently did nothing.
+function PortBtn({ port, index, active, tx, onActivate, t }: {
+  port: 1 | 2; index: number; active: boolean; tx: boolean;
+  onActivate: (port: number, antenna: number) => void;
+  t: (key: string, vars?: Record<string, string | number>) => string;
+}) {
+  const letter = port === 1 ? 'A' : 'B';
+  const cls = tx
+    ? 'bg-gradient-to-b from-red-500 to-rose-600 text-white border-red-400/50 shadow-[0_0_10px_rgba(244,63,94,0.5)] animate-pulse'
+    : active
+      ? (port === 1
+        ? 'bg-gradient-to-b from-emerald-400 to-emerald-600 text-white border-emerald-300/60 shadow-[0_0_9px_rgba(16,185,129,0.45)]'
+        : 'bg-gradient-to-b from-sky-400 to-sky-600 text-white border-sky-300/60 shadow-[0_0_9px_rgba(14,165,233,0.45)]')
+      : 'bg-card text-muted-foreground border-border hover:bg-muted hover:text-foreground';
+  return (
+    <button
+      type="button"
+      onClick={() => onActivate(port, active ? 0 : index)}
+      title={active ? t('agp.portDeselect', { letter }) : t('agp.portSelect', { letter })}
+      className={cn('w-8 shrink-0 rounded-lg text-xs font-bold py-1.5 border transition-all active:scale-95', cls)}
+    >
+      {letter}
+    </button>
+  );
+}
+
 // AntGeniusPanel — antenna-switch widget for a 4O3A Antenna Genius, styled to
 // match the app's light theme with soft gradients + glows. Each antenna row has
 // a port-A button (left) and port-B button (right). Colours: green = selected on
@@ -61,27 +92,6 @@ export function AntGeniusPanel({ status, onActivate, onClose, band }: {
     if (filtered.length > 0) list = filtered;
   }
 
-  const PortBtn = ({ port, index, active, tx }: { port: 1 | 2; index: number; active: boolean; tx: boolean }) => {
-    const letter = port === 1 ? 'A' : 'B';
-    const cls = tx
-      ? 'bg-gradient-to-b from-red-500 to-rose-600 text-white border-red-400/50 shadow-[0_0_10px_rgba(244,63,94,0.5)] animate-pulse'
-      : active
-        ? (port === 1
-          ? 'bg-gradient-to-b from-emerald-400 to-emerald-600 text-white border-emerald-300/60 shadow-[0_0_9px_rgba(16,185,129,0.45)]'
-          : 'bg-gradient-to-b from-sky-400 to-sky-600 text-white border-sky-300/60 shadow-[0_0_9px_rgba(14,165,233,0.45)]')
-        : 'bg-card text-muted-foreground border-border hover:bg-muted hover:text-foreground';
-    return (
-      <button
-        type="button"
-        onClick={() => onActivate(port, active ? 0 : index)}
-        title={active ? t('agp.portDeselect', { letter }) : t('agp.portSelect', { letter })}
-        className={cn('w-8 shrink-0 rounded-lg text-xs font-bold py-1.5 border transition-all active:scale-95', cls)}
-      >
-        {letter}
-      </button>
-    );
-  };
-
   return (
     <div className="h-full flex flex-col rounded-xl border border-border bg-gradient-to-b from-card to-muted/30 shadow-sm overflow-hidden">
       <div className="flex items-center gap-2 px-3 py-2 border-b border-border/60 bg-muted/40 shrink-0">
@@ -124,11 +134,11 @@ export function AntGeniusPanel({ status, onActivate, onClose, band }: {
                 : 'bg-card/70 text-foreground/80 border-border hover:bg-muted/60';
           return (
             <div key={a.index} className="flex items-center gap-1.5">
-              <PortBtn port={1} index={a.index} active={aActive} tx={aTx} />
+              <PortBtn port={1} index={a.index} active={aActive} tx={aTx} onActivate={onActivate} t={t} />
               <div className={cn('flex-1 min-w-0 truncate text-center text-xs font-semibold tracking-wide rounded-lg px-2 py-1.5 border transition-all', nameCls)}>
                 {pretty(a.name)}
               </div>
-              <PortBtn port={2} index={a.index} active={bActive} tx={bTx} />
+              <PortBtn port={2} index={a.index} active={bActive} tx={bTx} onActivate={onActivate} t={t} />
             </div>
           );
         })}