First off thanks Ste7of1, and second the link I posted is an antenna. It just goes inside the car. Like I said I have no idea how good it will work, but I have a feeling I will find out sometime this winter. They have this one too, it goes in the window and its cheaper. It will probable require some work to make it look good. They are powered so I'm guessing they will work pretty good.
Link for the window mounted.