I have a 2004 F-150 non heritage that I am trying to upgrade to a factory gps. The main wiring harness works fine. The antennas are an issue. I see that I need an under dash gps antenna part 10E893A. The factory gps unit does not have any where to plug the old fm antenna. There appears to be two antenna connections on the gps head unit. Do I need another antenna beyond the under dash one? Is there an adapter to get the old antenna to marry into the old antenna? Any assistance would be greatly appreciated. Thank you

 

I know a lot about f-series but under dash is not my thing but goto Haynes auto manuals and it show u every thing for your exact truck step by step