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Due to the fact that you nave two catagories of signal strengths to deal with (LOS and 2edge), You should consider two seperate systems. For the stations at 60 degrees magnetic I recomend an RCA ANT 751, no amplifier (it would over power your receivers).
For your mount, up to you. Just choose something that will suit your situation and aim to 60 degrees magnetic. I would not use the cable mulit-media splitter or the satellite splitter. Just use a simple two set coupler 50 to 1000 mhz and run new coax, or tie into your existing coax to feed your sets. If any of your runs are near the service panel, that should be a good ground point. A secondary grounding with a ground fault power strip at the sets will give you good back-up protection.
This system (even rotating) will do nothing for the stations at 161, 229, ane 273 magnetic. A seperate antenna on the roof would be required, and since these stations are 2 edge you need a large high VHF/UHF combination antenna, a High gain UHF/VHF pre-amplifier and a rotor. If you realy want to go forward with that, I will do some research and make a recomendation in a seperate post. At that time we can try to figure out where to place the A/B switch for selecting between the two systems.
As for the set in doubt. If it is newer than 2006 it should be ok. Also does it say DTV anywhere on the set? is there a dot on a button on the remote? Also in your set-up menu you will see some indication if it is digital. If not there are many ATSC tuners, even with DVR built in. Research and choose one that is well reviewed and fits your needs.
Sorry to be so vague on the large antenna system. I just wanted to let you know what you are getting into, so you can figure out the investment/return ratio before we start choosing exact equipment.
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