I recently upgraded TVs too. I kept the BOMB (Box Of Many Buttons), but also added a home AV receiver. The receiver replaced the original surround system.
I have the BOMB feed coax to the main tv and bedroom tv from either the antenna or the cable hookup at a site. I then have a bluray player providing input into the receiver. The receiver then outputs everything through HDMI to the main TV, and then the bedroom TV runs off of the BOMB output. (The receiver outputs old style rca composite output to the BOMB from BluRay so I can watch low def bluray in bedroom, not ideal).
In addition, I have an outside entertainment system. That is run off of a component cable (720P) that I run from the receiver to the TV. Unfortunately there is not a BOMB output to my outside TV, just a hookup for park cable. Reason that is an issue is I would like the antenna output out there.
I couldn't find a state of the art replacement for the BOMB, and likely wouldn't go through the hassle of rewiring coach for HDMI to use it.
American Revolution 40L CAT C9
Samsung 197, TireMinder, Ready Brute Elite with Wrangler