Quote:
Originally Posted by buckbeetle
In the convertible it is better to run the Sirius antenna to the front of the car, or on the dash. Because of the rollover safety system in the back of the vert, there is another firewall type wall that makes it hard to run wiring to the back.
Additionally you can replace the center dash piece with the one that has the little bubble for the antenna.

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We must have posted at the same time. I didn't see yours. But thats what I was talking about.
You can see some other pics of the antenna in a cabin filter how-to I posted here ->
How To - Cabin Air Filter Replacement
The factory XM antenna uses the old style antenna with two connections and uses the square type connectors. Don't know if there is a different antenna for Sirius.