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Cadillac Technician
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Mark,

There is a dome light in the back window area in the headliner.
There is a small rectangular door in it, pry it gently open and you'll see a 10mm head bolt.
Loosen that bolt a little, and then tighten it back up nice and snug, be careful not to break the screw.

That is the ground for the antenna module, sometimes they get loose and cause poor reception problems.
Also sneaking out from under the headliner are two snap on wires, make sure they are secure to the glass. If they come loose you'll have reception issues too. These have an amplified electronic antenna unit. They work great until the ground comes loose or you unplug one of the wires.
 
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