XM Antenna Upgrade

[lance-n]

I need help on how to install an upgraded XM Radio Antenna. Where I live, the stock one only receives the XM channels from 77 and up. On my other vehicles, I have installed the old style computer-mouse sized XM Antenna and they receive all the channels. I have three questions:

1) What is the easiest way to get behind the head unit to plug in the new antenna?
2) What is the connection for the stock XM antenna? (XM has one and two lead connectors and I need this info to order the right one. I realize that the stock antenna has the phone integrated into it and do not wish to change that in any way, other than disconnecting the XM lead at the head unit.
3) What is the safest path to run the antenna and where is the easiest/most practical place to mount it? (I get the punn here, no dirty minded comments please!)

I appreciate any help.
BTW it is blowing 35 knots here and raining the last 2 days thanks to tropical storm Emilia. It is good because we haven't had any rain here since last October - LOTS OF MUD NOW!!!!