radman:
There was a recent discussion sparked by a surveillance video of car thefts possibly against the new keyless systems (RFID type) I used tin foil and that still didn't block the transmission.
liudr, you lost me a bit are you saying you used tinfoil and it did not block transmission ?
Only stopped me from opening my trunk. I was able to get in my car with my key fob in my pocket wrapped in tin foil.