Good morning Bentley; From what I understand the cell phone antenna wire is located behind dash heating and A/C controls panel where the radio is also located. I had to install a new radio in my 01 Windsor and I have the cell antenna on top of the coach. There are a mess of wires behind the radio, but I did not go looking for the cell antenna wire. If the antenna wire is somewhere I think that is where it would be. Once you remove the screws for the control panel it is easy to look in that cavity and see anything is marked cell antenna. Someone else will come along nd give the exact location, but I am sure it is in that cavity. Hope this info helps and good luck fishing!