zed3
Think that happened about the time that airband receivers became widely available (Volstatic - anyone else remember them?). I seem to recall that EMA had a similar policy. Most sets didn't cause any problems but there was a cheapy converter available that you stood next to your medium-wave broadcast receiver. The box down-converted airband sigs to a frequency that could be picked up by the broadcast receiver, but in the process emitted enough RF to present a real hazard to ATC communications. The powers-that-be came down very hard very quickly on the importers.