Removal Procedure

WARNING: This page is about a different car, the 2004 Saturn Ion Red Line, 2004 Saturn Ion 3, 2004 Saturn Ion 2, and 2004 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.

Lower the headliner. Refer to Headliner Replacement (w/Sunroof) or Headliner Replacement (w/o Sunroof) in Interior Trim.
Disconnect the cables from the antenna.
Loosen the retaining nut until the antenna assembly can be pulled from the top of the roof.

Fig 1: View Of Antenna Assembly

Courtesy of GENERAL MOTORS CORP.