I use an FMA failsafe FM receiver in place of the standard Futaba FM receiver. With staight FM, had at least on glitch per flight, usually at the same location on the field, but non with the FMA failsafe. An LED on the FMA radio blinks a code to tell me how many times it was hit in a flight. Have not had one glitch in several hundred fights on several FMA receivers. The FMA has digital signal recognition which, apparently, does a good job. I can program each channel for "last good signal" or "failsafe position". To test, I had a buddy turn on my backup transmitter - on same frequency. Radio went from in-control to failsafe several times but remaind level and controlable.