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The signal reception strengths are Strong Signal Strengths at your reception location and are LOS=Line Of Sight.
A antenna system amplifier is Not required at your reception location.
The signal strengths are strong and a Antenna System Amplifier Can Actually Make Reception Worse.
Install the ANT751 antenna above the roof in such a manner that the , attic , roof , building , are not , obstructing , impeding , blocking , reception in the directions of , West , North West , North , East , South East.
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Aim the ANT751 antenna at about 301 degree magnetic compass direction.
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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 , tablet and etc. compass.
Also to assist with the 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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Most likely , the reception situations/problems are also caused by , defective matching transformer (balun) , defective coax , defective connectors , defective connections , defective couplers , defective etc.
Also remove All satellite system components , Yes the Coaxes of the satellite system can be used for the antenna system.
Also the ANT751 antenna and coaxes the make up the ANT751 antenna system Must Not be connected to any active cable system coaxes , not cable tv , not cable internet service , not cable phone service.
Any type or kind of cable delivered service must be on a separate coax.
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As a->Test<->to Prove Reception.
Remove the matching transformer (balun) from the ANT751 antenna.
Connect a NEW Matching Transformer (Balun) to the ANT751 antenna.
Connect a NEW Continues Length of Coax to the New matching transformer (balun) , and run the New Continues length of coax through a open door or window direct to 1 Tv.
No couplers.
No ground block coupler.
No splitters.
No nothing.
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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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Also know this.
As always , trees and tree leaves , plants and plant leaves , have a Negative Effect on broadcast Tv reception and so do buildings and other obstructions including your own , attic , roof , building.
Some and not all Negative Effects are.
Absorbing and Blocking Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice for Reliable Reception is install the antenna at a location that has the least amount to no amount of obstructions in the directions of reception in the directions of reception.
At your location that is , West , North West , North , East , South East.
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What is reception like now??