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An A/B switch is not required.
A antenna rotator is not required.
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Above the Peak of the Roof in such a manner that the roof and building are anot , obstructing , impeding , blocking , reception in the directions of , South , West , North West , North.
Install a , Antennas Direct , DB8e , Current UHF channels 14 thru 51 antenna.
Aim 1 panel at about 195 degree magnetic compass direction.
Aim the other panel at about 258 degree magnetic compass direction.
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Here is how to aim antennas.
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna , do not trust a , cell phone or tablet and etc. compass.
Most Digital Tv's have a Signal Strength Meter and some Digital Tv's also have a Signal Quality Meter.
As always , the antenna aim direction and antenna location can be adjusted for best reception.
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About 3+ feet below the DB8e antenna install a.
http://www.antennacraft.net.
Y5-7-13 , VHF high band channels 7 thru 13 antenna aimed at about 278 degree magnetic compass direction.
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Install a.
http://www.antennacraft.net.
10G221 preamplifier.
Connect the DB8e antenna to the UHF connection of the 10G221 preamplifier.
Connect the Y5-7-13 VHF antenna to the VHF connection of the 10G221 preamplifier.
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For 1 Tv connected use No splitter.
For 2 Tv's connected use a , Holland Electronics , HFS-2D , 2 way splitter.
For 3 Tv's connected use a , Holland Electronics , HFS-3D , 3 way splitter.
Buy the , HFS-2D , HFS-3D , splitters at ,
http://www.hollandelectronics.com , or ,
http://www.amazon.com.
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Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html. Install the 3 foot or 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html. Install the , ronard(4560) , eave antenna mount.
http://www.ronard.com/ychim.html. Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
http://www.ronard.com.
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Home Depot has , 10 foot 6 inch length - 1 and 3/8 inch diameter , TOP RAIL , chain link fence , PIPE , that makes excellent antenna mast/pipe. The price is low at about 12 dollars.
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For the Best Reception avoid aiming the antennas in to trees and other obstructions in the directions of reception.