Install a Winegard HD7696P Antenna in the attic aimed at about 176 degree magnetic compass direction.
Here is how to aim antennas ,
www.kyes.com/antenna/pointing/pointing.html
Use a Real and Actual magnetic compass to aim antenna.
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Install a Winegard , LNA-100 'Boost' antenna system amplifier.
Most attics have electric power outlet and light in the attic , install the LNA-100 'Boost' amplifier in the attic.
For 1 Tv connected use No splitter.
For 2 Tv's connected use a simple common 2 way splitter.
For 3 Tv's connected use a simple common 3 way splitter.
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If reception issues/problems happen that are not resolvable with aim and location adjustments in the attic.
And the weaker signal strength Tv stations/channels are not receivable.
Then move the HD7696P antenna to above the peak of the roof.
In such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , south west , south , south east , east , north east.
Here are some places to buy antennas and etc. .
www.solidsignal.com
www.amazon.com
www.winegarddirect.com