I am assuming he has the GM xm antenna that is on the roof (passenger side) near the front corner marker light?? If so, the light bar would interfere with the reception when he is headed north.
My xm antenna is a magnetic mount and I experienced the same issue and had to move my antenna to another location to avoid the interference.
If possible, ask him to slide the light bar back a few inches and see if that helps.
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03 Black Adventurer, Radix Supercharger, Corsa Exhaust, Edelbrock Headers, Air Raid Cold intake.
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