I got a pioneer deh-p8mp and I was installing the wire harness I bought but I notice there isn't any wire for the power antenna coming out of the HU,it is on the harness I bought but not in the HU harness.I know it wouldn't be a problem hooking this wire somewhere and make the antenna work but it would stay up all the time and I would like it to go down when I use a cd.what can I do and what are my options?I need help.if anyone own this HU and can help me I'll apreciate any help I can get