I've only been shot down once. On the trim flight no less!!!! (talk about making you really mad). Plane was about 75' up and about 500' out. somebody standing about 50' BEHIND me (a.k.a. farther away from the plane than I was) turned on. The plane went into a roll straight into the ground. I couldn't even pull the throttle back. I had no control at all.

When two transmitters are on that close to each other, their signals seem to mix and the receiver just gets garbage signals in.

Just my 2 cents worth