Is it the only antenna on the car? There are several manufactures that now offer one single antenna that can do multi bands such as cell/pcs/radio/GPS all in one unit.
But it could just be a single band antenna for either the computer or radio.
If it's a little white hockey puck, it's probably GPS/AVL, especially if they don't have another puck on there anywhere, and especially if they already have a stubby 800 nub on there.
If it's a little white hockey puck, it's probably GPS/AVL, especially if they don't have another puck on there anywhere, and especially if they already have a stubby 800 nub on there.