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The following information are main situation/problems and not the only situation/problems with Tv reception.
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The Current Tv Channels that are being Transmitted and Received in the , USA , Canada , Mexico , are.
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VHF low band channels 2 thru 6.
Are effected in a Negative Way by natural interference , sun shine , atmospheric static , lightning.
And human made interference , electronic and electric.
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VHF high band channels 7 thru 13.
Are effected in a Negative Way by , Multi-Path Reflections Tv signals bouncing all around. Digital Tv tuner computers can correct multi-path up to a certain point and then the multi-path is , To Much.
Channels 7 and 9 are effected more by multi-path then the other VHF high band channels.
Using a omnidirectional antenna such as and not limited to the FDTV2A , receives multi-path from all directions , receiving multi-path from all directions is , Not Good.
To reduce the reception of multi-path , use a directional antenna that receives better in the the forward direction and less at other directions to the directional antenna.
The VHF high band channels , 7 thru 13 , are also effected in a Negative Way by human made electronic and electric interference.
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UHF channels 14 thru 51.
Are effected in a Negative Way by Signal Attenuation , meaning Absorbing and Blocking reception. And also multi-path reflections.
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As always , the inside of buildings and attics , increase multi-path reflections bouncing all around and absorb and block Tv signal reception.
And human made electronic and electric noise is greater inside of buildings and attics.
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Recommend install a directional antenna aimed at KUSA-DT channel 9.
Above the Peak of the Roof in such a manner that the the roof and building are not , obstructing , impeding , blocking , reception in the directions of , South West , West , North West , South , South East.
Install a AntennaCraft, HBU11 antenna.
Or a ANT751 antenna.
Aimed at about 199 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.
As always , starting antenna aim direction is the --> starting antenna aim direction.
The antenna aim direction can be adjusted for the best reception.
Most Digital Tv's have a Signal Strength Meter and some Digital Tv's also have a Signal Quality Meter.
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The Tv signal strengths are strong at your reception location , a antenna system amplifier is not required.
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Also Digital Broadcast Tv 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
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Here are some places to buy antennas and etc. .
http://www.antennacraft.net.
http://www.amazon.com.
http://www.solidsignal.com.
Home Depot or Lowes can have the ANT751 antenna in stock in the store , no matter what the Home Depot and Lowes web sites say.