As recently as a few days ago I had all the channels. I have two Roku tv's, an ONN and a HIsense, both having the same issue now. Two of the local channels don't appear in the menu on either one, unless I restart the network and leave it disconnected from the wireless. Another channel which is part of the same local station and same tower five miles away shows up and has good signal strength. So, two Roku tv's, same problem with same missing local antenna channels when connected to internet wifi, both resolve when disconnected from internet. I've reset the router, did power off and plug resets on the tv's, checked updates, rescanned channels, checked 'hide channel' and settings. Any ideas?
