Not to reckon people trying it out but just for info, the metal
material lining the interior of radio devices (especially those
signal sets used by the military) can used to blog GPRS (or is it
GPS) signals. So if someone plant a tracking device on you or your
car, used one of those metal pieces, bend and wrap it around the
said device and you will disappear on the radar.
wow, can blog about gprs signals nowadays huh.