For mounting my sat antenna on the roof(rear center), I took the third brake light trim off, and ran the leads for my Sirius antenna into the cab through the same grommet that the brakelight wiring goes through. I also had to remove the interior trim to fish the wires around the rear window, down, and then ran them under the sill plates on the passenger side to my sat tuner under the front passenger seat. If you go this route, you'll need some foam adhesive trim mounting tape to remount the third brake light trim. Wasn't really that hard and resulted in a clean, protected wiring route. Good Luck !