Just turn your transponders off and sneak out low
. How many times have you heard "altitude unknown", or seen the replays of the fantastic wide berths Heathrow have to force their jetliners to do when someone penetrates the A without a code? They basically can't tell what altitude you're at because radar is not very precise. Ask yourself -
if radar was so precise, then surely, they wouldn't need a blanket no-fly zone, right?
I'm not saying you should do this, but I also understand it's in their interest to
make you believe that they can see, hear and track everything very precisely. It's part of keeping you in check to have you fear that. My subversive nature tells me it would be nice to find out how much you could tweek the nose of the George Orwells. I'm not going to do it, but I'd certainly love to see someone else do it.