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Based on the provided Tvfool reports.
Going to 40 feet antenna height above ground has no useful increase in signal strength.
And looking at the signal strengths at the 10 foot antenna height and the 25 foot antenna height , looks like a antenna height above ground of about 20 to 25 feet or so above ground will receive the receivable Tv stations with 1 antenna aimed in 1 direction.
Recommend install a Antenna Craft , HBU44 antenna above the Peak of the Roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , North East , East .
Aim the HBU44 antenna at about 30 degree magnetic compass direction .
Here is how to aim antennas ,
www.kyes.com/antenna/pointing/pointing.html .
Use a Real and Actual magnetic compass to aim antenna .
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Install a Channel Master CM7778 Preamplifier .
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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 splitters at ,
www.solidsignal.com
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Here are some above the roof antenna mounts .
www.ronard.com/909911.html
Use the , ronard(911) , 5 foot tripod antenna mount .
www.ronard.com/Tripods%200703/4712.html
Use the 10 foot tripod antenna mount.
www.ronard.com/34424560.html
Use the , ronard(4560) , eave antenna mount .
www.ronard.com/ychim.html
Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
Buy the ronard antenna mounts at ,
www.solidsignal.com , by typing , ronard(x) , in the solidsignal search box or buy from
www.ronard.com .
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The Tv/s Must Channel Scan for the , OTA=Over The Air , Digital Broadcast Tv stations channels , often named the ~DTV Channels ~ Antenna Channels ~ Air Channels ~ in the Tv Setup Menu because the Tv transmissions travel through the Air from the transmitting antenna to the receiving antenna .
Some digital Tv's will Automatic channel scan for cable Tv channels.
DO NOT channel scan for cable Tv channels .
Go into the Tv Setup Menu and select ~ DTV Channels ~ Antenna Channels ~ Air Channels ~ .
Scan for channels .
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Here are some places to buy antennas and etc. .
www.solidsignal.com
www.amazon.com
www.antennacraft.net
www.channelmaster.com
www.ronard.com
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As Always , trees and tree leaves , plants and plant leaves , have a Negative Effect on Broadcast Tv Reception and so do buildings and other obstructions including your own roof and building .
Some and not all Negative Effects are
Absorbing , Blocking , Reception
Multi-Path reflections bouncing all around.
The Best Practice is to install the HBU44 antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception .