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The signal strengths are improved at 25 and 40 feet antenna heights above ground.
No requirement to go to 40 feet antenna height above ground.
About 25 feet above ground will provide reliable reception of the Richmond Digital Broadcast Tv Stations/Channels.
Above the Peak of the Roof at about 25 feet above ground install a.
Channel Master CM4228HD antenna aimed at about 120 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.
Buy the CM4228HD antenna at ,
http://www.channelmasterstore.com , or ,
http://www.amazon.com.
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Install a , Channel Master , CM7778 preamplifier.
The FM radio interference trap of the preamp will be in the , in/on position.
Buy the CM7778 preamplifier at ,
http://www.channelmasterstore.com , or ,
http://www.amazon.com.
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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 and 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.
Use the , ronard(911) , 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html.
Use 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) .
Buy the ronard antenna mounts at ,
http://www.ronard.com , or ,
http://www.amazon.com
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Home Depot has , 10 foot 6 inch length of 1 and 3/8 diameter , TOP RAIL , chain link fence , PIPE , that makes good antenna mast pipe , the pipe can be cut shorter , the price is low at about 10 dollars.
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As always trees and tree leaves , plants and plant leaves , have a Negative Effect on Broadcast Tv Reception with a Tv antenna and so do buildings and other obstructions including your own roof and building.
Some and not all Negative Effects are.
Absorbing and Blocking Tv Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice for Reliable Reception is to install the antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and building.
The directions of reception at your location are , South East , East , for Richmond.
And West North West for Charlottesville.
For Reliable reception of the Charlottesville Tv stations at about 303 degree magnetic compass direction , I recommend a higher antenna height of about 40 feet above ground.
You can Test the reception of the Charlottesville Tv stations with the Tv antenna at about 25 feet above ground.
Aim the antenna at about 303 degree magnetic compass and rescan for channels.