I don't disagree entirely with Derek. You're going to be flying relatively close in and light sport only so the chances of a drop out are low. However, the reliability of an orangeRx in a relatively vibration prone heli (compared to a foamie plane at least), with more carbon and other materials to reduce signal strength, with a lot of more weight in play and much higher money investment is my concern. If you have a quality sat on there, in addition to the built in antenna, then you should be okay. Like I said, I'd be doing frequent range checks and control checks before flights to make sure all is well before spinning it up. Make sure the Tx is charged up pretty well before flights too.