I have a 2006 Quad Cab with factory radio and satellite. I'm replacing it with a Kenwood or Pioneer satellite ready radio. I was told that I would need a new satellite receiver and antenna and that the old ones will not work. On this model the antenna is on the back of the roof and connects to the satellite receiver located in rear of the passenger compartment which is then connected to the radio. If I follow the advice given by the audio store where I am planning on purchasing the radio, I will have a new satellite receiver and antenna in addition to the now unconnected and inoperable OEM units. Is there any reason that I can't use the OEM receiver and antenna?