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Can Test reception with a smaller antenna.
Above the peak of the roof in such a manner that reception is not , obstructed , impeded , blocked , to the , South East , South West , North East , North West.
Install a ,
http://www.antennacraft.net.
HBU11K antenna , aimed at about 136 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 , do not trust a cell phone compass.
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A antenna system amplifier will most likely not be required for 1 or 2 Tv's connected.
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For 1 Tv connected use No splitter.
For 2 Tv's connected use a 2 way splitter.