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A simple reception situation.
Install a ,
http://www.antennacraft.net , HBU11K antenna Above the Peak of the Roof aimed at about 50 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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A antenna system amplifier is not required.
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As always , avoid trees and other obstructions in the directions of reception.
The directions of reception at your location are , North , North East , East , South South West , West North West.
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Digital 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