All TV's have an HDMI input. All TV's will have coax for over the air channels.
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To clarify, there is not a central HDMI hub that feeds everything. We have no idea what a customer will set up. Each will have a coax cable so you can watch HD TV over the local channels. What you do after that is up to you, but they can all take input from an HDMI source.
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I have a friend who is into home automation and I am investigating options for AV in the RV.
Most of the deployment scenarios require an ethernet cable to each TV that then goes into an adapter which converts the signal to HDMI. Not sure what the costs are but don't want to carry a ton of BlueRay Disks or DVDs for the minions to watch while rolling down the road. My friend mentioned the system would likely be based around the RTI or URC controller platforms.