WARNING: This page is about a different car, the 2015 GMC Terrain and 2015 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio Antenna
Courtesy of GENERAL MOTORS COMPANY
Callout
Component Name
1
Radio Antenna Procedure Rotate the mast counterclockwise in order to release the mast from the antenna base.