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The Signal Strengths are Strong at your reception location.
Even so.
For improved reception install a ,
http://www.antennacraft.net.
HBU11K antenna.
Above the roof in such a manner that reception is not , obstructed , impeded , blocked , by the , attic , roof , building , in the directions of , South , West , North West , North , North East , East , South East.
Aim the HBU11K antenna at about 180 degree magnetic compass direction.
A antenna system amplifier is Not required.