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The Tv signals are strong at your reception location.
The FreeVision should work Ok.
Aim the FreeVision antenna at about 270 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 antenna , do not trust a cell phone or tablet compass.
Replace the matching transformer (balun) with a New outdoor matching transformer.
Connect a NEW Continues Length of Coax to the New matching transformer and run the New Continues Length of Coax through a open door or window direct to 1 Tv.
No antenna system amplifier. Disconnect and Remove All Parts of the amplifier , Disconnect and Remove the Preamp , Disconnect and Remove the Power Injector/Power Supply.
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Digital Broadcast Tv Tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.
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Can also Test reception with a ,
http://www.antennacraft.net.
HBU33 antenna aimed at about 270 degree magnetic compass direction.
No antenna system amplifier.
Use the same Test coax.
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For a antenna system amplifier use a ,
http://www.antennacraft.net.
10G201 preamplifier.
With the Test coax.
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What ever antenna is used , install the antenna 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 , West South West , West , North West , North East , East , South East.