In my area, Antenna TV plays on a digital sub-channel, so it plays all day, 24-7, without a break from classic TV.
MyNetworkTV was Fox's replacement for UPN. It hasn't been very successful. In your area, the station probably took on an extra network to fill up time. Be happy they didn't go with infomercials, like PAX.
The infomerical guy I like is the old 'Ronco' guy who sold everything from spray to hide the bald spot to ovens. I think that guy could sell ice to Eskimos?
Oh,yes....that guy was okay. But then I was interested in some of what he sold. Maybe that makes a difference.