I hadn't thought about that... part of me wishes mine had OnStar but the other part of me is glad that I don't have the shark fin. I've seen it on a few and its just odd looking. The XM antenna is hardly noticeable in comparison.

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2007 SLY w/ Ebony Leather & Top
Power | Convenience | Polished w/ Polished Caps | LSD | ABS | A/C | 6-Disc w/ MP3 | Monsoon | XM
GMPP CAI | GMPP Cat-Back Performance Exhaust | Kappashield | 2.55" Stubby | Kappapouch | GXP Alum Sill Plates | GM All Weather Mats & Splash Guards

My mother said to me, "If you are a soldier, you will become a general. If you are a monk, you will become the Pope." Instead, I was a painter, and became Picasso. ~Pablo Picasso