Locating all receivers at a central location and controlling them via RF (or IR remote) is doable. Also each receiver can provide output to more than one TV simultaneously. The problem you will have is getting the HD video signal from the HD receivers to their respective TV sets. At present there is no readily available method to get that signal down a single coax. The HD output is either HDMI or component video (you can use either or both) which cannot be carried on a single coax. If such a thing as an ATSC modulator existed for home use, then you would be good to go. But, to the best of my knowledge, that animal does not exist.
To do what you desire, you will need HDMI or component video cables from your central location to your HD TV sets. The SD sets can be serviced via conventional RF modulators.
To do what you desire, you will need HDMI or component video cables from your central location to your HD TV sets. The SD sets can be serviced via conventional RF modulators.