Removal Procedure

Lower the rear of the headliner far enough to access the antenna module. Refer to Headliner Replacement (With Sunroof) or Headliner Replacement (Without Sunroof) in Interior Trim.
Disconnect the electrical connectors from the radio antenna module.

Fig 1: View of Radio Antenna Module
Courtesy of GENERAL MOTORS CORP.
Remove the fastener securing the radio antenna module to the roof beam.
Remove the radio antenna module.