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The signal strengths are strong at your reception location , should be no problems with reception.
Most likely is Bad coax and Bad connections and Bad couplers and splitters.
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To Prove Reception.
Replace the matching transformer (balun) that connects the antenna to the coax with a New matching transformer.
Connect a New coax to the matching transformer and run the New coax through a open door or window in to the house to a good location where a New 3 way splitter can be connected.
And 3 New coaxes are connected to the New 3 way splitter and run the 3 New coaxes to each Tv.
Just run them through the house to the Tv's.
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Digital Tuners can develop -Digital Glitches- that are not cleared out with simple channel scans.
To clear tuners do Double Rescans.
http://www.wchstv.com/DoubleReScanAlert.pdf.
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Also to Prove Reception , aim antenna at about 180 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.
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Also , 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 roof and 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 to install the antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and building.
The directions of reception at your location are , South West , South , South East.
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What is reception like now??
