Depending on how much money youre willing to spend, you can have it output on as many TV's as you like. If you want to run it thru coax, and have "ok" quality, you could have an infinite amount of TV's hooked up with the use of splitters and one RF modulator.
Now if you want quality, there is all different types of equipment that you would need to buy, and configure.
However, like the above poster said, this would basically just be "mirroring" the outlet to TV's. So whatever is on your main TV, will be on all the others. You would have to also purchase an IR sensor for each TV if you plan on changing the channel in each separate room, but the channel will be the same on all TV's.
Hope that makes sense.