Like I said, you programed the radio for end point and direction of travel, so with that said, why do we have to tell it twice which way to go when it looses signal, kinda stupid if you ask me. Say you had to reverse the throw because the throttle was backwards, well, that tells the TX that the idle is at the bottom and WOT is at the top, it just gives a reverse signal to the servo, if this part of the program in the TX doesn't copy over into the failsafe setup then JR and Spectrum has major safety issues with their programming. Youo shouldn't have to tell it twice which way to go weather it gets signal or not. But as far as the ground effect issue, the plane is at the same altitude as the TX, and if it can't tell the RX to keep idling at 120 meters away, repeatilly, then the next stop for the TX is the manufacture or the trash can.
I really think you ment 120 feet, because I'm just drooling over the thought of a 360' runway, and that's if your standing at the very end.