Since the grid-style antenna is attached directly to the rear window glass, any antenna failure means you need a replacement glass installation, which is safer to have a professional carry out. You can fix a damaged antenna grid the same way you fix a defroster grid in the rear window. Repositioning the antenna is similar to taking it down, and the wires connect the grid to the music system on the dashboard through the roof underside, just above the ceiling upholstery.