All H2s have OnStar, which uses the roof antenna over the driver's head for GPS and cellular. In 2005 this antenna was modified to also support XM.
If the H2 is also equipped with navigation, it has an additional GPS antenna in the dash.
I junked the OnStar and connected the OnStar's GPS roof antenna to my NAV unit. It has a much better view of the sky.
My suggestion would be to use an aftermarket GPS antenna, unless you are junking OnStar.
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