I had a similar problem before with another headunit, I doubt its defective. It has to do with the power antenna wire. I forgot exactly but i'll find out tom. and let you know
^^^ ding! ding! ding! It sounds like you have an external amp that is not getting a signal to turn on unless the antenna is on. Please connect it to the proper remote turn on lead.
yep that was the problem. I ended up returning the HU though. I didntl ike the fact that the faceplate could not come off. im looking into stock or other decks in the 300 region