Changing Chrysler sirius to Alpine xm

2005 Chrysler Sebring sedan - Factory CD unit with sirius Sat receiver

My questions basically revolve around the re-use of my factory chrysler sirius antenna. I want to change the factory setup to an all alpine setup, changing from sirius to xm to get college basketball. Its been a few years since ive done an install and i have never done satellite. Seems simple to start with, but i have a factory antenna and do not want to have to wire up another one.

1. Do they all use the same smb plug to plug in the antenna? So that i could swap my factory tuner box out in place of the alpine sat receiver.

2. Is the tuner in the passenger side trunk area as i suspect? It is freezing out, dont want to have to fire up the heater and be digging around out there :)

3. Does the factory chrysler Sat receiver have power wired up so that i could probe and find power from the factory sat receiver plug? Or will i need to run wire?

Pre thanks for any help