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Higher antenna height above ground does not provide any more Tv stations and provides little improvement of signal strength.
So , 10 to 25 feet above ground antenna height is Ok.
Closer to 25 feet above ground is better.
Install the C5 , aimed at about 239 degree magnetic compass direction for reception of , Analog channel 7 and the other Digital Tv stations channels that are stronger of signal in the other directions will be received.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
A antenna system amplifier will most likely not be required for , 1 or 2 Tv's connected.
Here are some places to buy antennas and etc. .
http://www.saveandreplay.com.
http://www.trentondistributors.com.
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Also here is a way to receive All of the , USA , PBS channels for free and also other Tv channels for free.
Here is a web site to learn more.
http://www.ftalist.com.
Here is a Quality receiver.
www.manhattan-digital.net
Also check with , saveandreplay and trentondistributors , for FTA.
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And for those that are in the USA and Mexico that are reading about the FTA , Yes FTA is received in the USA and Mexico.
And as a matter of fact , FTA is receivable almost every where around the world and most every one around the world knows about FTA and many receive FTA all around the world.
The people's that know the least amount of information and are receiving the least FTA , are the USA people's the ones that are born and raised in the USA.