I too have the same install as Phil. It works great even with the antenna folded down. Everybody who sees the Cobra75 mounted like in Phil's pic thinks its OEM.
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'03 Hummer H2 Adv./Lux. Pkgs. Sunset Orange W/Sunroof
Air Spring Susp. Pkg. + 3rd. row seat & DVD System.
CompuStar Auto Security/Remote Starter.
http://www.haugens.com