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The Tv signal strengths from Lookout Mountain are Very Strong Signal Strength at your reception location.
Do not use any type or kind of amplifier , not built in , not add on , not preamp , not distribution amp , no type or kind.
Install a ,
www.antennacraft.net , HBU11K antenna that comes with a J pole type mount.
Install the HBU11K antenna outside at a location that is up high and has a good unobstructed view of Lookout Mountain.
As a Test to prove reception.
Connect a New continues length of coax to the matching transformer of the the HBU11/K antenna and run the New continues length of coax through a open door or window direct to each Tv , One at a time.
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Digital Tuners can develop -Digital Glitches-that are not cleared out with simple channel scans.
To clear tuner of each Tv do Double Rescan.
www.wchstv.com/DoubleReScanAlert.pdf
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What is reception of each Tv like now??