I installed a Pioneer AVIC-2 flip screen GPS with Sirrus radio in both my limited coupe and SRT6. Both have the sirrus antenna rear center and the nav in the coupe is under the dash and unseen, and the SRT6 is center near the windshield on the dash. I reason it's visible is because the manager at circuit city said it was impossible to get a signal from under the dash antenna mount and he would not allow his tech to install it as I ask. OK, put it where you will (makes absolutely no difference in signal strength). Hope this helps a little.