On the far west end are the Diamond X and the Den. Those two places are across from each other. I have watched a game at both.
The Den is the better of the two. Not overwhelmingly large so you'll be close to a TV and can probably hear the announcers if you care, or you can visit with your friends. The Diamond X noise level is absolutely awful. You won't hear the game, nor the person sitting across the table from you. Chances are you're probably not too close to any of their screens either. Far from ideal for watching a game. Each place offers food though I can't recommend either of them as offering particularly good food.
In Billings if you're going to watch a game at a bar go downtown. It is never hard to find parking. Go to Hooligans. Every seat is close to a TV. They have a diverse menu and their food actually is tasty. Far and away the best choice for watching a game in public.
I suppose you could also stare at 0-4 if you're inclined to pump up their esteem.