Oh yes, motorised antenna. Doh!
At the moment I have a car antenna, with a male jack. There seems to be two parts to the jack ie. positive and negative, certainly isolated from each other. The single core trailing aerial wire is screwed into the male proboscis that fits into the head unit. The outer part of the jack is not connected to the wire at all and I presume the antenna is connected to the case of the head unit by the isolated part of the antenna??
This is my jack:
http://www.maplin.co.uk/Module.aspx?...ldID=&doy=19m4
How would I connect it to the head unit case?