What kind of range should you expect with engine running at idle and antenna collapsed? A better question is what range is acceptable? I am having problems with RF interference Everything ignition and receiver is at least 12 inches apart. I have done everything I can think if to fix the problem. There is no metal to metal, I have a nylon throttle pushrod. I routed the Receiver wire outside the plane as quickly as possible and I replaced the stainless steel pull pull system with kevlar. with all of that I get about 40 feet before the control surfaces start to flutter.