I've been a SIRIUS user for quite some time now but went with the portable Audiovox unit so I could move it from vehicle to vehicle and into my home and office. As for the antenna, on my Dragon it's mounted right in the center of the insert and the cable was just routed through an existing opening in the firewall. On my IronMan I got more creative and mounted the antenna inside the rear spoiler. In both cases I didn't have to cut or modify anything on the VX and they each receive great, plus I still have the stock antenna for AM/FM if needed.