feat: For steppir & Ultrabeam,possibility to change each element length

app.go

@@ -10752,6 +10752,9 @@ type motorAntenna interface {
 	// frequency and has no individual-element command).
 	Elements() []int
 	SetElement(num, lengthMm int) error
+	// ReadElements queries the controller for the current element lengths on demand
+	// (Ultrabeam CMD_READ_BANDS); SteppIR returns an error.
+	ReadElements() ([]int, error)
 }
 
 // ubAdapter / steppirAdapter wrap each concrete client to the shared interface,
@@ -10765,7 +10768,8 @@ func (a ubAdapter) SetFrequency(k, d int) error { return a.c.SetFrequency(k, d)
 func (a ubAdapter) SetDirection(d int) error    { return a.c.SetDirection(d) }
 func (a ubAdapter) Retract() error              { return a.c.Retract() }
 func (a ubAdapter) LastSetKHz() int             { return a.c.LastSetKHz() }
-func (a ubAdapter) SetElement(n, mm int) error  { return a.c.ModifyElement(n, mm) }
+func (a ubAdapter) SetElement(n, mm int) error   { return a.c.ModifyElement(n, mm) }
+func (a ubAdapter) ReadElements() ([]int, error) { return a.c.ReadElements() }
 func (a ubAdapter) Elements() []int {
 	if st, err := a.c.GetStatus(); err == nil && st != nil {
 		return st.ElementLengths
@@ -10792,6 +10796,9 @@ func (a steppirAdapter) Elements() []int             { return nil } // SteppIR:
 func (a steppirAdapter) SetElement(_, _ int) error {
 	return fmt.Errorf("individual element control is not available on the SteppIR")
 }
+func (a steppirAdapter) ReadElements() ([]int, error) {
+	return nil, fmt.Errorf("individual element control is not available on the SteppIR")
+}
 func (a steppirAdapter) Status() motorStatus {
 	st, err := a.c.GetStatus()
 	if err != nil || st == nil {
@@ -11119,6 +11126,15 @@ func (a *App) MotorSetElement(num, lengthMm int) error {
 	return a.motorAnt.SetElement(num, lengthMm)
 }
 
+// MotorReadElements queries the controller for the current element lengths (mm),
+// so the operator adjusts from the real values instead of blind. Ultrabeam only.
+func (a *App) MotorReadElements() ([]int, error) {
+	if a.motorAnt == nil {
+		return nil, fmt.Errorf("antenna not connected — enable it in Settings → Antenna")
+	}
+	return a.motorAnt.ReadElements()
+}
+
 // SetUltrabeamDirection switches the antenna pattern: 0=normal, 1=180°,
 // 2=bidirectional (re-issues the current frequency with the new direction).
 func (a *App) SetUltrabeamDirection(direction int) error {