Windshield antennas are built into the windshield and are embedded between the outer and inner layers of the glass, and if the antenna is damaged, it would need to be replaced at the same time the windshield needs to be replaced. The rear window antenna uses a grid baked onto the back window glass surface, the same that the rear window defroster consists of, and it could as well be replaced in the same way as the back window defrocer grid. In models which belong to the category with cellular navigation system or digital satellite radio, the antenna is mounted upon the roof therefore requiring removal of the headliner and the side curtain airbag modules depending on the vehicle model therefore explained why it is highly recommended that the services of a dealer service department or qualified repair shop be sought to undertake the task of replacing such an antenna.