Quoting 2000GTX:
Well my initial theory was to somehow set it up on an auxiliary switch someplace that powered the motor. This way the antenna would just be down all the time.
But then again maybe I'll just look at some short antenna options.
Well you could use a switch, or you could wire it to the radio antenna remote wire and would go up and down when you turned the radio on (staying down while the radio is off or when you are using a non-radio input). As for the wiring diagram, regardless of your installation, you would need to know what connection does what on antenna motor itself.