If you split the video output it might work, but I can only guess how to picture would look. You can go to Radioshack or your local parts store and pick up some RCA y-splitters and some cables and see what happens, I dont see what it wouldnt work. I know for a fact you would NOT be able to display different pictures on different TV's (example playing multi player games and have different screens on each TV)
I almost forgot to add the fact that you will probably need a signal booster as well
I've used y-splitters to put an N64 on 2 screens at once (Goldeneye multiplayer, we covered the other teams part of the screen with cardboard). It worked well.
Yup $50 I have 5 of them....................dont ask I have a TON of stuff hooked up around my house. Not to mention getting them for 50% helps alot as well.