Thanks all for your replies, I am trying to find out how to use this on a VY VZ antenna as they differ from a VT VX. The VY VZ automatic antenna has only one wire coming from the back of the head unit not two. Does anyone know what the signals are that are sent from the head unit to raise, lower, or adjust the height of the antenna and is this controlled more from the BCM or not. If so, again what are the signals sent to the BCM from the head unit. This is a tough one as I can't find an answer for it anywhere.
Thanks everyone.