Sounds like they set mine up a bit different. I have a mechanical switch box, that does work when switching to cable, as well as the power to the King HD antenna. (Even though it doesn't seem to matter if I turn the power on or off at the antenna). As you can see in the picture you can't really see that there is a little push button by the green light that got pushed when packing the storage up.
Drove me crazy till I figured it out so I'm posting on case anyone else has this issue.
Randy and the dogs in our 2016 Georgetown XL 369 Black Diamond towing a Jeep Wrangler.