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2018 Acadia with a loose antenna base. I can move it up and down a few centimeters from its standard flush resting position on the roof. Is there a way to tighten it down? Or is it that a clip is busted and needs replacing? Otherwise the satellite works well, no issues with radio reception. Suggestions?
 

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First, I hope you mean a few millimeters. "A few centimeters" is close to an inch (1 in=2.54 cm)!!

Second, I believe the antenna base is held to the roof by a mounting nut. The headliner will have to be dropped to tighten the antenna, regardless of how it's attached. That should be repaired ASAP to minimize a risk of water leaking into the vehicle.
 
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Suggestions?
1. Per above; quickly so you don't end up with water damage.
2. Should be under warranty? Have dealer fix.
 
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