I checked around, and didn't find any mention of the game being available on a Roku channel. I would try the official NFL channel, NFL Now!You might try Nowhere TV, FilmOn, channel PEAR, Nowhere Stream. All are private channels. Also, Livestream and NBC News, but those are longshots.
I should remind people about what happens when a major sporting event is streamed: Server crashes, freezing, degraded picture quality, all due to the large number of people trying to watch at once. You may be better off trying to improve your antenna system rather than attempting to watch online.