Mounted mine on the bracket in the fairing, rode thru 8 western states and never once lost a signal on xm except mabe once in a long tunnel in the mtns.
My 07 I had the dealer install the XM and they installed the antenna on top of the radio. The reception was marginal at best. I just finished installing the factiory XM myself on my new 09 Ultra and located the antenna on the bracket at the top of the fairing inside and I have max reception, 3 bars. I guess if you want it done right due it yourself! I also installed 2 new front speakers, the latest J&M's. I have the back 2 on order. The system sounds great.
Thanks all , I'll try it under fairing on top of radio . Hope it works in Pa.
I don't know whereabouts in Pittsburgh you are, but I live near the airport and have XM on an 09 SG. The antenna is under the fairing (I just saw it when installing an ARC mini last week) on a small bracket not far from the bottom of the windshield to the right if you are looking at the front of the bike. As another post above said, it looks as if the bracket was made to mount the antenna. The XM goes out in several places, but only momentarily. Really not a problem.