My antenna recently broke off and the antenna motor is goign nuts. It's buzzing even with the engine completely shut off and the keys are out. The only way I shut it off was by disconnecting the battery.

Anybody know how to disable this antenna motor or replace it?

 

I'm pretty sure you could unplug the relay, it's on the interior passenger side under a trim panel on the dash, on my '88 it's the relay with six wires going to it colors are black/pink/orange and gray/dk green/white, the side with the gray, green and white is the one going to your antenna if you unplug this from the relay your antenna motor will not get any power, and the spazzing antenna should be quiet.