hi

got a disk player thats got wires for 4 speakers, constant power, acc power, earth, remote wire but no antenna control wire,

was wondering how to wire a aftermarket power antenna up so it only goes up when listening to the radio but go back down when you use usb/cd as well as when the keys off

is it possible to make a circuit that brings the antenna half way up and flick a switch to go all way up

If the stereo doesn't have a radio antenna out wire, there is no way to tell the antenna that it's time to come out or retract.. best you can do is hook it to the blue amp remote wire and then put a switch in the wire on your dash somewhere.. that way it's up when the desk is on, but you can manually make it go down if you want.

As for the halfway switch.. if that is possible depends on what antenna type you bought.. was it fully auto or semi?

cheers

Frank