I came across this yesterday and it worked well over my Roku stick. Locast is a new service that allows people to stream local channels on any device and has apps on Roku, Appletv and other TV connected devices.
I know a lot of people have trouble getting a signal and don't like the idea of being tethered to the TV, so here is another option for us. It's a non-profit so will be dependent on donations to keep it going, it appears. But wanted to point it out to people as it looks like it may be a good option. I am not sure if it will work for someone out of the area to stream since I live in Portland and just tried the channels here.