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The 25 foot antenna height does not show that much improvement in signal strengths of the Tv stations/channels to the , South , South East.
So somewhere between 13 feet and 25 feet antenna height above ground.
The Tv stations you are after are to the , South , South East.
Install a Antennas Direct DB8e UHF Channels antenna aimed at about 148 degree magnetic compass direction.
(The UHF Channels are 14 thru 51.)
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Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna.
The starting antenna aim direction is the -->starting antenna aim direction.
Most Digital Tv's have a , Signal Strength Meter , and some Digital Tv's also have a , Signal Quality Meter.
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Install a , Antenna Craft , Y5-7-13 , VHF high band channels 7 thru 13 antenna.
Aim the , Y5-7-13 antenna at about 181 degree magnetic compass direction.
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Install a , RCA , TVPRAMP1R , preamp.
The preamp has separate inputs for the , UHF antenna and VHF antenna.
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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.solidsignal.com , or ,
http://www.hollandelectronics.com.
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Here are some roof top 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.solidsignal.com , buy typing , ronard(x) , in the solidsignal search box or buy from ,
http://www.ronard.com.
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Here are some places to buy antennas and etc. .
http://www.amazon.com.
http://www.solidsignal.com.
http://www.ronard.com.
http://www.hollandelectronics.com.
http://www.antennacraft.net.
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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 and Blocking Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice is to install the antenna/s 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 house.
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The Tv/s Must Channel Scan for the , OTA=Over The Air , ATSC-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 , ATSC-Digital Broadcast Tv Stations/Channels.