Well, to help explain your plot, the good thing is that the stations you are after are in one general cluster just S-SW of your location. Distance is about 18-38 miles on average. Ch 4 - WSKY is further away at 55 miles. It's a VHF-Hi broadcast, which you can see on the bottom chart. Is Ch 4 a station that you would like to tune? If not, that could simplify things a little.
How's your view of the SSW horizon from your house? Nice shade trees can play havoc with TV signals.
You are going to need a preamp to feed so many TV's. Do you know how the in-house coax is wired? Hopefully the input from outside comes into a closet/basement/garage where it can be split and distributed around the house.
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