Yes, this happens quite often. Anytime that the reflected signal is 180 degrees out of phase with the prime signal and of nearly equal amplitude, the signals cancel. It is just like turning off your transmitter as far as the receiver is concerned. This can also happen if the transmitter is near a good reflector so that the signal bouncing off the reflector is out of phase with the transmitter.l We had a chain link fence near the transmitter area and, if you stood at the right spot you could predict where the plane would experience a dead band. By standing right next to the fence, no problems. Usually, if the plane is high enough and moving in the right direction, the interferance or drop out will be brief and you can recover as the plane flys thru the dead zone.