I am installing a Garmin 496 in an Air Gizmo mount just above a 430W. The right angle XM antenna cable has to be bent an uncomfortable amount to clear the 430. The XM cable has a mini USB connector on it. The plan was to just buy a short extension cable to correct the problem. I have bought two different mini USB extension cables. Both have 4 pins wired and are bout 6 " long. The 496 does not detect the XM antenna with either extension cable installed. Detects the antenna immediately when it is plugged in directly. Anybody have experience with this or any ideas?