I highly recommend you skip the cable and depend upon your own good sense to ensure you don't leave your site without visually checking the antenna. The antenna takes a little while to stow and driving off too soon could still have the antenna up while you begin driving. Also, its possible for the controller to shut down with a loss of 120V power so if you didn't check to see if the controller is powered up before driving off, no control signal from the cable will allow the antenna to stow as there is no power going to the antenna. Sorry to ramble on but I have discouraged the use of this cable for years and stand by that position today. There are simply too many things that could go wrong to make it a worthwhile option.
I apologize that I did not answer your question.