I "installed" a Roady 2 in my G6 Sunday.
1)Tapped the heated seat fuse in the rear fusebox for circuit that is routed under the front passenger seat (seat bolt for ground). Added a 12V accy plug there.
2)Put the XM antenna on the rear decklid, ran the wire down beside the right rear passenger seat, under the door jamb plastic, and under the front passenger seat with the power wire in step 1.
2)Removed the G6 dash plate that pops in above the accy plugs and fed the cord from the Roady 2 power plug (under the seat) along and under the floor console, then up thru the lower dash and out of the hole created by removing the G6 name plate. Also ran the XM antenna cable thru that same hole, then used the supplied Roady 2 mount (two sided tape) just above the accy plugs (still acccessible).
Everything works like a champ. Only time I lose service, or get fadeouts, is when I am parked in the carport, sometime.