I was experiencing interference on my CH Ignition converted G-62 powered Stinger a while back. I'd had the RX batteries and throttle servo too close to the engine. After moving them both further aft, approx 12 to 16" separation, the problem disapeared. I see in Model Airplane News on a few ocassions now where they've showed the throttle servos mounted up forward of the firewall. I cringe when I see a major magasine, or for that matter anyone here, condoning such a thing. While you may get away with it for a while, I suspect interference may crop up that'll bite you. Too me, it makes sense to try to maximise your RX reception ability (reduce potential for interference) by separating the engine gear and radio gear as much as possible. I also use a fibre optic kill switch - nice piece of kit!