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The reception signal strengths of many of the Tv Stations are Strong to Moderate Signal Strengths.
And are LOS=Line Of Sight.
Most of the Tv stations are fairly close at about 50 miles.
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As a Test of reception.
install a ,
http://www.antennacraft.net.
HD850 antenna.
Above the Peak of the Roof.
Aimed at about 240 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 antennas , do not trust a , cell phone , tablet and etc. compass.
As always , the antenna aim direction and antenna location can be adjusted for best reception.
Most Digital Tv's have a Signal Strength Meter and some Digital Tv's also have a Signal Quality Meter.
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Reception can be Tested Without and With a ,
http://www.antennacraft.net.
10G201 preamplifier.
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As a Test of Reception Connect a New Continues Length of Coax to the antenna and run the New Continues Length of Coax through a open door or window direct to 1 Tv.
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Here are some and not all above the roof antenna mounts.
http://www.ronard.com909911.html. The , ronard(911) , 5 foot tripod antenna mount.
http://www.ronard.com/712.html. The ronard(712-50-10) , 10 foot tripod antenna mount.
http://www.ronard.com/ychim.html. Measure around the chimney and use a , ronard(2212) , ronard(22180 , ronard(2224) .
http://www.ronard.com.
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Home Depot has , 10 foot 6 inch length , 1 and 3/8 inch diameter , TOP RAIL chain length fence , PIPE , that makes good antenna mast/pipe , the price is low at about 12 dollars.