I just ran a range check with my new ship. Futaba 9-C Xmitter on 72 mHz, Futaba R149DP PCM receiver, Deans whip antenna mounted vertically in the nose and attached to receiver antenna as per Deans instrs. (rx wire cut to about 7 inches) with failsafe programmed.

With antenna fully collapsed at 500 ft. failsafe still was not activated either with engine off or engine on (2 separate tests -jet). Finally turned the xmitter off on each test just to make sure the failsafe was actually working - it was. I would challenge anyone to get that kind of range antenna down with PPM and a wire rx antenna without glitches.