You should be able to find a VGA to Composite scan converter in any basic electronics shop (tell them you need to display a computer monitor on a TV)....then a basic VDA (Video Distribution Amplier)--or several hooked up together--for composite video.

***EDIT*** You may only be able to find composite gear with RCA jacks in which case you whould then get RCA to RF adapters....should be fairly inexpensive all in all***

Check the connections onthe back of the TVs b/c you might be able to daisy chain a few of them if they have RF out jacks.

Hope this helps