ATRH2 the antena goes under the dash between the light sensor and the air bag switch, you have to remove the upper dash and screw the antena on the metal frame with an existing screw. I had XM from before and it works great, you also retain all the steering wheel controls as you are used to on the factory radio! 
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"2003 Sage green LUX, wrapped around brush guard with off road lamps, roof mounted SMA light bar, AirAid Jr. kit, Delphi Touchscreen Navigation Radio with a 6 CD changer and more! Also a member of the HOPE (Hummer Owners Prepared for Emergencies) pro
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