You can buy a component distribution amplifier and then you connect both TV's to the amplifier and the apple TV to the amplifier. Then both TV's can watch the same program.
http://www.amazon.com/Component-ypbpr-Video-Distribution-Amplifier/dp/B000NK75HI
OR
A passive component video splitter, but this degrades the video quality somewhat, you may not notice it though. You will also need a splitter for the audio as well.
http://www.monoprice.com/products/p...=10422&cs_id=1042205&p_id=2848&seq=1&format=2
OR
You could buy one of those inexpensive component video switchers sold for PS/3 and XBOX 360 consoles. You then connect the Apple TV to the "output connector" and then each TV into two different inputs. The only problem here is that you can only watch the Apple TV on 1 tv at a time. You select which TV get's the signal with the switch box.