I still think this is an opportunity for microphone mfrs (should one be lurking around here. 
)... If the loading from a nearby ground plane shorting the RF field increases antenna load, maybe sense for that and turn it off when I detects that it is "ground(plane)ed". Of course if the mechanism does not draw that much more current then it really doesn't matter.
JR
Hmmmm, until the "ground plane" of a performer's hand around the mic shuts it off? I'm not a huge fan of "smart devices"-they too often turn dumb at the wrong time!
