I just purchased a Navigation Unit for my 2007 ford edge. it did not come with a Navigation system, but it does have the black antenna on the top of the car near the trunk. Is there any chance that this antenna is compatible with the Navigation Unit i purchased? it is from a mercury mountaineer, it is made by pioneer, the wires fit perfectly, and it fits my car and the radio works just fine (the only problem is the GPS wire). Please help!! If you need any just ask me! THANK YOU!!!