Removal Procedure

Remove the left rear sail panel. Refer to SAIL PANEL REPLACEMENT in Interior Trim.
Remove the rear assist handles. Refer to ASSIST HANDLE REPLACEMENT in Interior Trim.
Disconnect the electrical connectors from the radio antenna module.

Fig 1: Disconnecting Radio Antenna Module Electrical Connectors
Courtesy of GENERAL MOTORS CORP.
Remove the fastener retaining the radio antenna module to the roof beam.
Remove the radio antenna module.