I've got the Sirius XACT Visor model radio...the cheapie...It works great. I mounted the exterior antenna through the overhead console and headliner. It works great but I mount the radio on the dash - Got tired of looking through the antenna wire hanging down from the headliner so I put Velcro on an antenna disc and at the front of the dash. I was told with tinted window that the antenna would not work

But it works just as well as the exterior antenna. I drive from the SoCal area to Idaho about once a month.

The only place the signal is lost for no reason is on I-15 near the Raceway...Nellis AFB is there and I think they jam

the signals for security in that area. Otherwise it works fantastic. I move the radio to my company car a Ford Crown Vic and put the antenna on the dash...still works great.
Just my $0.02 --