How does the Shark fin antenna attach? Mine is missing and I would like to replace it. It is the for xm and when I am in the mountains I will sometimes lose the signal. I am guessing that it is a GM only part?
Assume you are talking about the top piece, not the base. On my 06, it unscrewed about a quarter turn (counter-clockwise) and then you pulled it off. Similar design to the way you install a headlamp bulb...sort of.