I have found out that if you have a broken GVR4 power antenna and you want to fix it cheap. Get a 1G power antenna unit that is good and you can swap the antenna rod/cord/tube/screw tip from the 1G into the GVR4 motor and mounting hardware.
It takes about 30 minutes to do and works perfect. In the end, you have the 1G telescopic rod and antenna tip with cord inserted into the GVR4 tube and chrome cap, and use whatever motor works better. You use the GVR4 wiring to work with the cars harness.
Sorry I did not take picures but it is really simple.