A distribution amp like
this will allow you distribute audio and composite video to 4 TV's. You would then need some method of relaying the remote commands back to the source components.
A
channel modulator allows two different components to be distributed throught the house on a single coax. The quality is average but you have more flexibility. With IR targets, you will also have the ability to control the source components from any Tv.
If you want better quality or more sophisticated control, be prepared to pay up. For example, sending HD over cat-5 cable to a single TV would cost $1,000 based on buying 2
baluns. Distributing it to multiple TV's is even more since it requires a distribution amp.
-Robert
-Robert