If your going to run and antenna and you have several TVs the best way to do it IMO is to run a pre-amp right on the the best/biggest yagi antenna that will fit on the roof. Aim it for the best signal. Use an app like this to find where your antenna's are at.
http://www.antennapoint.com/
Use a compass app on you phone to aim it.
Then use a good quadsheild coax to a 8-way splitter.
Run coax to each TV. (assuming you can)
The 8 way splitter will really knock down a lot of db(-10.5 db). So you may need another amp. Easy way to do some checks is with different splitter and they try a 2-way(-3.5) splitter and then 4-way splitter(-7db). With many of the digital TV's now they have a signal strength meter on them.