GM Service Manual Online
For 1990-2009 cars only

The fixed mast antenna can withstand most car washes without being damaged. If the mast should ever become slightly bent, straighten it out by hand. If the mast is badly bent, replace it.

Check occasionally to make sure the mast is still tightened to the antenna base located on the roof of the vehicle. If tightening is required, tighten by hand.