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Does the xm anteanna of an xm radio receiver have to be outside the car or on the window??? or can it be wedged between the headliner and the roof??
Like the post above said,,, does not have to be outside of vehicle but must have a (somewhat) unobstructed view of the sky. Mounting securely on the inside rear window package shelf or the top of the dash would be acceptable, but usually a little better outside of car.