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Install 1 Tv antenna.
Above the roof install a ,
http://www.antennacraft.net ,
http://www.antennacraft.com
HBU11K antenna
aimed at about 240 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html
Use a Real and Actual magnetic compass to aim the HBU11K antenna , do not trust a cell phone compass.
As always , the starting antenna aim direction is the -->starting antenna aim direction.
The antenna aim direction can be adjusted for best reception.
Most Digital Tv's have a Signal Strength Meter and some Digital Tv's also have a Signal Quality Meter.
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A antenna system amplifier is not required for 1 , 2 , 3 , Tv's connected.