But now I have another question regarding radios.

On my Senioritta - I use the same Futaba T4EXA radio as my LT-40 uses (flight pack with same frequency, same type of receiver and servos, etc.) and when the antenna is extended all the servos work great and smooth. But when the antenna is collapsed the servos jump around in a terrible frenzy out of control, and stop again when I extend the antenna.

WHY?

EDIT: No I do not have the LT-40 turned on at the same time. I make double-sure the RX is off. And everything works beautiful on the LT-40 with antenna extended and collapsed. So its not the TX.