I painted the XM/Onstar antenna to match my car.
Ordered a new antenna from
www.gmpartsdirect.com for $44 shipped. Part # 92239705
Here is what you will need:
Mask, sand and clean...
Paint with adhesion promoter...2 light coats, then 1 medium coat.
Then paint with primer, again 2 light coats and 1 medium coat.
Wet sand with 600 grit W/D sandpaper until it is smooth.
Dry, clean and prime it again, 2 light coats and 1 medium coat.
Time for a few color coats...wet sand lightly with 1000 grit W/D and apply several light coats of clear.
On to installation..
Move the seats forward and fold down the back seat. Protect surfaces that need it...
Tools needed: 8 and 10 mm 1/4" scocket and ratchet, panel tool, upholstry tool and a small flat bladed screwdriver.
Remove the bolt cover from both clothes hangers.
Use the 8 mm socket to remove the bolts and pull hard to remove the hanger retainers.
Remove the two headliner retainers with the panel tool very carefully.
Use the upholstry tool to remove the C-pillar covers. They also cover the rear portion of the side curtain airbags and have very good connectors. You can let them both hang by the black plastic strap that is supposed to keep them from becoming projectiles when the side air bags go off.
Carefully lower the headliner, pulling it out of the B-pillar plastic and forward to the middle of the doors.
This is what you will see above the back edge of the lowered headliner.
Remove the 10 mm bolt and 4 prong antenna retainer and disconnect teh two antenna leads.
Remove the black antenna.
Apply some wax while you have a chance.
Remove the 10 mm bolt and 4 pronged retainer from your freshly painted shark fin and feed the antenna leads through the hole.
Go back inside the car and reverse the steps you took to remove the antenna.
Admire your handiwork.