Idk if you have a bunk over the driver/passenger area, but, I placed my antenna under the mattress up there and it works almost flawlessly. Drove almost 3k miles this summer all over the northwest with no issues. I ran the wire under the dash and up the passenger side wall to the bed area. I used tan cable covering from Lowes that matches the tan interior perfectly. I did not feel comfortable drilling a hole in the roof.
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