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--->As Always<--->Antennas receive the Best with least amount to No Amount obstructions in the directions of reception.
Aim 1 panel of the DB8e antenna at about 26 degree magnetic compass direction.
Aim the other panel of the DB8e antenna at about 189 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 a antenna/s.
As always , the starting antenna aim direction is the --->starting antenna aim direction.
The antenna aim direction and Also the antenna location can adjusted for best reception.
Most Digital Tv's have a , Signal Strength Meter , and some Digital Tv's also have a , Signal Quality Meter.
Signal Quality is Important.
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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.
www.wchstv.com/DoubleReScanAlert.pdf
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The PA-19 preamplifier is most likely overloading from the Strong Tv signals.
This overloading from the strong signals will make reception worse on some channels.
Remove All parts of the preamplifier , Remove the preamp unit , Remove the power injector , Remove the power supply, and Remove any other amplifiers.
For this Testing of reception have only 1 Tv connected.
No splitters.