It's tough to try to remotely troubleshoot something like your problem, but we can at least give it a shot...
Here's some things to consider:
* Try to find out what the model number is for the Winegard antenna. More to the point, you should try to find out if the antenna is VHF/UHF or UHF only. If it's a combo, it probably would help to have a UHF-only instead. That's not a guaranteed fix, but having UHF-only is more likely to pull in all the stations reliably.
* I don't know your exact location, but it sounds like you're pretty close to the cluster of transmission towers in St. Louis. As a result, it may be difficult for you to aim your antenna in such a way as to pick up all of the stations from all of the towers. Understand that I'm speculating here, but if that's true, you might try to see if you can aim more directly at KMOV to pick up that signal, probably at the expense of one (or more) of the stations that are further to the periphery of KMOV. If you find that's the problem, you could consider a second antenna or a rotor as a long-term solution, or just temporarily re-aim the antenna before the Super Bowl to ensure you're going to get a good signal then.
* Does your receiver have multiple antenna inputs (Ant A and Ant B, for example)? If so, you might want to try connecting an indoor antenna to the second antenna input (Silver Sensor) to see if you can pull in just KMOV over that antenna. My DTC-100 allows me to do this, though I haven't actually tried feeding two antennae at the same time. I'm not sure how that would work on the Samsung box, or the unified program guide (the guides are separate on my older STB). Maybe someone else here with more experience with the Samsung STB can chime in whether that's an option or not. Again, I wouldn't normally suggest this sort of kludge, but as you sound very determined to see the game in HD, it might be worth a try. BB sells the SS and they generally have a very liberal return policy, so if it doesn't work out you're not really out of pocket, though of course there is an additional hassle factor.
That's all I can think to suggest at the moment. If another idea occurs, I'll post it here. Hopefully one of these ideas will help you, or maybe someone else can come along with some suggestions that fix your problem.