I don't believe you c n splice easily into this. The GPS antenna is used by the onstar system and installing SMA connectors is not for the light of heart.
When I Installed my system I used the aftermarket antennas positioned above the rear door next to the side rails. You can't really see them as they are black, like the rails and about the size of a book of matches
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2006 H3 Birch White,LUX/Adventure PKG,Sunroof,Chrome Pkg,Pioneer AVIC-N2 Navigation/XM Radio
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