XM Antenna Wire - Single or Double

[sredishTX]

Does the stock XM antenna use a single or double wire to the HU? Will one of these adapters work with the Sirius/GM adapter box to eliminate needing to use the add'l antenna? Has the Monsoon system with XM. Also, what would be needed to put a double-din nav screen, as far as the Onstar system?

http://www.tss-radio.com/sirius-dual...er-p-3910.html

http://www.tss-radio.com/sirius-ante...er-p-3883.html

Edit: This is not my first post but I lost the password to my other username and I've changed emails so I reregistered... and I've been searching my arse off.....