Removal Procedure

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Remove the antenna by sliding it towards the front of the vehicle from the bracket in small increments.
Disconnect the coaxial cable from the antenna.
Remove the antenna from the bracket.

Fig 1: Navigation Antenna Replacement
Courtesy of GENERAL MOTORS CORP.