I range checked with the engine running a good 100 or more feet. Antenna was down. The left aileron was moving up and down about 1/8". It's the only thing we saw wrong. It was worse at full throttle than idle.
Does it stop when you extend the antenna? Does it do it with the engine
not running? It could just be engine vibration shaking the aileron. A little more info might help to find the problem.