The roof mounted antenna works with Satellite Radio, Phone and GPS. If you want to hook-up your RNS-E directly to your antenna you need to purchase a GPS Extension Cable - FAKRA to FAKRA. The hook-up is located on the rear passenger side pillar, remove it carefully. You will see two connections, near the roof; one blue for the Fakra (GPS) and one pink for factory phone. Hook-it up, run the cables and your all set. I always pick-up 7-8 satellites, under the dash I always got 4-5.