I have flow several flights between 20,000 and 22,000 feet range. They were flown in the Arizona desert with no signal interference. Radio range is not a factor, signal display is at 3 bars at 20,000 feet and there is no signal reception issue. Battery capacity is the limiting factor. I landed at 20% battery remaining. The flight were flown in normal mode at full speed (26.8 mph).
mode at full forwa
