Thanks for the replies. So it is a self-powered line, cool.
Tongsli: I like the stock microphone idea. I don't have a sunroof. I was hoping it would fit into the fixture that I have already, the dinky little "speaker" holes are there
Other questions/comments: why not use a Telematics antenna, isn't it already setup for 800MHz AMPS & GPS (isn't GPS 1900MHz?)??? Also, regardless of what antenna is used for the cell phone, instead of looking for a special connector to convert to what we want at the antenna end why not just get the factory cable and see what connector is on the end of it. The p/n from vwnavi for the phone cable is #3B 503 555 0 AG as used in the triplex. I do not know if this is the same cable as called out for the Telematics antenna cell phone (Onstar of course in USA).
BTW my cell phone is 800MHz only.
Again if the antenna turns out to be PITA... then I might get a stick-on or in-the-bumper Hirschmann. I like the hidden in-the-bumper idea.
I am having second thoughts about running the cell phone through the Monsoon. What happens if you take a call when the Monsoon is off? Maybe it is better to use a separate buried speaker - plus you could still listen to stuff while talking which could be an advantage especially if you want weather or a traffic report.