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The signal strengths do not improve much .
However because the signal strengths are So Weak and so Far Away and have 1 and 2 Edge Path obstructions.
The closer you can get to 40 feet antenna heigth above ground the reception will be improved because the higher antenna height will get the antenna above most close ground clutter.
Keeping in mind the signal strengths are very weak and transmitters are far away with path obstructions.
I recommend install antennas that are designed to receive as much signal as possible.
I recommend install 2 antennas.
A Antennas Direct , DB8e , UHF antenna.
And about 3 feet below the DB8e antenna on the same mast install a.
http://www.antennacraft.net.
Y-10-7-13 VHF antenna.
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Aim both antennas at about 138 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.
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/Tripods%200703/4712.html.
Use the , ronard(4712-50-10) 10 foot tripod 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 and Lowes have 10 foot lengths of , Top Rail , chain link fence Pipe that makes good antenna mast. The price is Low Dollars.
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Install a ,
http://www.antennacraft.net , 10G221 preamplifier.
Connect the DB8e UHF antenna to the UHF connection of the preamplifier.
Connect the Y10-7-13 VHF antenna to the VHF connection of the preamplifier.
Have the FM radio trap switch in the in/on position.
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For the initial hook up of antennas and Testing and Adjusting for best reception.
Have only 1 Tv connected , I recommend run a continues length of coax from the antenna/preamplifier , through a open door or window direct to 1 tv.
No splitters.
For coax that is outside , use RG-6 Coax that has the Compression type connectors on the ends of the coax , not the crimp type connectors.
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When all is setup and working well.
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 places to buy antennas and etc.
http://www.amazon.com.
http://www.antennacraft.com.
http://www.hollandelectronics.com.
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For your consideration and evaluation and money.
Here are , Free Standing , No Guywires , Light Weight , Aluminum , Lay Over Towers.
Do antenna install and adjustments standing on the ground.
http://www.palcoelectronics.com/pe300.aspx