I tried putting mine under the back window but my rear window has the antenna and defoggers so I was unable to get any sat locks. I now run it along the side, across the ceiling, on top of the rear view mirror. I tucked all the wires so the only thing you really see is the gps receiver on top of the rear view mirror. I live in las vegas so I had to find some heat resisitant adhesive to hold it during the summer. Works well now though.