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Above the Peak of the Roof install a ,
www.antennacraft.net , HBU11K antenna aimed at about , 129 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.
Recommend avoid using a antenna system amplifier because of the Very Strong local Tv transmissions.
Those Strong local transmissions can overload a signal amplifier and be the cause of bad reception of some channels.
As is with All reception situations , avoid obstructions to reception in the directions of reception.
Avoiding obstructions is important if you will like to receive the Weak Signal Strength Tv stations.
Test reception with only 1 Tv connected , No splitters.
Digital Tv tuners can develop -Digital Glitches - that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
www.wchstv.com/DoubleReScanAlert.pdf
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Most Digital Tv's have a , Signal Strength Meter , and some Digital Tv's also have a , Signal Quality Meter.
Signal Quality is Important.