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40 and 60 feet antenna height above ground , Not much improvement of signal strength and 2 edge path obstructions=hills and mountains.
However higher antenna heights then 25 feet above ground can improve reception.
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This reception situation requires the Big Antennas.
Above the Peak of the Roof in such a manner that reception is not , obstructed , impeded , blocked , by the , attic , roof , building , in the directions of , South East , North North East.
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Install a , Antennas Direct , DB8e , Current UHF channels 14 thru 51 antenna.
http://www.amazon.com.
Aim the DB8e antenna at about 149 degree magnetic compass direction.
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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 , do not trust a , cell phone , tablet and etc. compass.
To assist the best reception , most Digital Tv's have a Signal Strength Meter and some Digital Tv's also have a Signal Quality Meter.
As always , the antenna aim direction and antenna location can be adjusted for best reception.
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Also about 3+ feet below the DB8e antenna install a.
Winegard HD5030 VHF Channels 2 thru 13 antenna.
http://www.warenelectronics.com.
Aim the HD5030 antenna at about 150 degree magnetic compass direction.
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Install a.
http://www.antennacraft.net.
10G221 preamp.
Connect the DB8e UHF antenna to the UHF connection of the 10G221 preamp.
Connect the HD5030 VHF antenna to the VHF connection of the 10G221 preamp.
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As a Test to Prove Reception.
Connect a NEW Continues Length of RG-6 Coax and run the NEW Continues Length of New Coax through a open door or window direct to 1 Tv.
Yes the , preamp unit , power injector , power supply , are connected.
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After the Test of reception.
The coax that you will be using for Tv connections in the building can be connected.
Install All New Coax outside.
Use coax that has the Compression type connectors on the ends of the coax , so as to keep Weather/Water out of outside connections.
Replace outside ground block coupler with New.
Any splitters will be replaced with New.
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 , HFS-3D , splitters at ,
http://www.hollandelectronics.com, or ,
http://www.amazon.com.
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To start , install the antennas about 25 feet above ground.
Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html. Install the , 3 foot or 5 foot tripod antenna mount.
http://www.ronard.com/712.html . Install the , ronard(712-50-10) , 10 foot tripod antenna mount.
Do not bolt tripod in place until prove reception , the tripod might have to be moved to find best reception.
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http://www.ronard.com/ychim.html. Install the , ronard(4560) , eave antenna mount.
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http://www.ronard.com/ychim.html. Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
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Home Depot , has 10 foot 6 inch length - 1 and 3/8 inch diameter , TOP RAIL , chain link fence , PIPE , that makes excellent antenna mast/pipe. The price is low at about 12 dollars.
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Snug tight All connections , so as to keep Weather/Water out of outside connections.
After the Testing of reception and the reception is Ok.
Can make Double Sure Weather/Water does not get into connections and coax and devices , wrap with ,
http://www.coaxseal.com