My transponder antenna is behind the pilot's seat only 6 to 8 inches from my lower torso. Should I be concerned about the RF exposure from this antenna this close to my body?

I put a piece of heavy aluminum foil on the seat back under the seat foam. The foil is not grounded to anything. Is this sheet of foil attenuating the RF at all?

Mike Reinath
Std. build 360
N3602M