The video was interesting but doesn't prove anything. The phenomena illustrated could happen if the world were flat, or round. It wouldn't make any difference. Light exhibits electro-magnetic wave properties of a very high frequency. I have seen other electro-magnetic waves in other frequency ranges do pretty much the same kind of thing. Time lapse photos of the same view of across the lake to Chicago over a period of many months would tell you a lot more. It would answer the question of whether what you were seeing is normal or just a transient phenomena. When I was a kid I used to tune our old TV across all the channels just to see what I could pick up. We only had two local stations at the time, but every once in a while I could watch a Chicago TV station 180 miles away. I was lucky to get a reasonable picture from Chicago once or twice every couple of months. Now a computer program can predict when such things are likely and amateur radio operators take advantage of such things. I have been a Ham, myself, for over 50 years but I don't usually engage in hobby communications much anymore. My job kind of ruined the hobby. It seems to me that when you have a NASA video, or a video from any other source that shows a global earth that those videos are deemed fake and/or photo shopped. Why trust any video when there are other more scientific ways to prove that the earth is a globe.