Removal Procedure

Remove the cell antenna base from the inside of the glass, by grasping the base and pulling outward.
Disconnect the coaxial cable from the cell antenna base.

Fig 1: Removing Cell Antenna Base
Courtesy of GENERAL MOTORS CORP.
Remove the antenna mast from the outside of the glass, by grasping the base and pulling outwards.
Remove all residue by using a razor blade and isopropyl alcohol.

Fig 2: Removing Residue With Isopropyl Alcohol
Courtesy of GENERAL MOTORS CORP.