Actually, listening to ATC is not at major criminal offence, as long as you stick to reciveing!
(Start transmitting, and we send out the VDF groups of the fire service to locate your ass! (
) And they will be acompanied bye the police
One other thing we do not appriciate is people listening in on the airband and recording, and publishing it after, let's say a plane crash.
Use your common sense, and everybody stays happy!