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I have no idea if it makes a difference or not, but I was worried about that also. I went ahead and mounted it according to the directions on top of the radio inside the fairing. I have no complaints at all.....reception is great.
Bought a 3 pocket winshield pouch and mounted my xm in the center pocket, went to xmfan store and bought the smallest antenna they make, mounted it with velcro on top of the pouch, I have only lost reception one time and that was at Mount Rushmore under Washingtons nose...hahaha