I came from work to mess with my antenna to try to pick it up over-the-air. I happened to have our Amazon Prime Video account open on our Amazon stick and went to the Live TV folder and what do I find? Amongst the hundreds of channels it offers, it includes the PBS channels for Iowa, South Dakota and Nebraska. The Nebraska one is working perfectly and the guide suggests the game will be shown at 7:30.
So, if you happen to subscribe to Amazon Prime Video, go check the live tv folder and see if you get that channel.