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Discussion Starter · #1 ·
Has anyone mounted a rooftop cargo box that has the navigation and/or XM radio? I have two questions:
1) Does the box interfere with the antenna location?
2) Does the box interfere with the reception of the radio or navigation?

I have a large Thule box (15cf) that I would mount up on the roof occasionally and was wondering what kind of issues I would run into. I did a search here and looked at the pictures but couldn't really find my answer.
 

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Where is the nav system antenna?
 

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bg1811 said:
Where is the nav system antenna?
I do believe that the back antenna is all-in-one. XM, GPS, AM-FM, and OnStar. Some one correct me if I am wrong.
 

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I had the GM Thule box on top for 2200 miles in June. No problem with XM or NAV. Just a hit on mpg.
 
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