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Ok , little to no signal strength advantage of 40 feet antenna height.
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Antenna System #1.
So at about 20 to 25 feet or so above ground , for reception of Digital Broadcast Tv stations/channels , to the North and North East.
The following are the North Group.
CHEK-DT , Real UHF channel 49 , virtual number (6.1) , Independent Tv.
CHAN-DT , Real UHF channel 22 , virtual number (8.1) , GTN.
CBUT-DT , Real UHF channel 43 , virtual number (2.1) , CBC.
CIVI-DT , Real UHF channel 17 , virtual number (17.1) , CTV2.
CIVT-DT , Real UHF channel 32 , virtual number (32.1) , CTV1.
CBUFT-DT , Real UHF channel 26 , virtual number (26.1) SRC French Tv.
The following are the North East Group.
KVOS-DT , Real UHF channel 35 , virtual number (12.1) , Me-Tv.
KBCB-DT , Real UHF channel 19 , virtual number (24.1) , Estrella Tv and a Shopping Network.
K24IC-D , Real UHF channel 24 , virtual number (28.1) KBTC PBS.
Above the Peak of the Roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception to the , North and North East.
Install a Antennas Direct , DB8e UHF Bowtie Panel antenna aimed at about 0 degree magnetic compass direction.
Here is how to aim antenna ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna.
Further antenna aiming , Think of your self standing behind the DB8e antenna looking out toward the Tv transmitters.
The Left 4 Bowtie panel is aimed at about 0 degree magnetic compass direction.
The Right 4 Bowtie panel is aimed at about 39 degree magnetic compass direction.
For 1 Tv connected Test reception with no antenna system amplifier
Use No splitter with 1 Tv connected.
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Antenna systems 1 and 2 are Separate antenna systems all the way to the location of the Tv.
At the location of the Tv , connect antenna systems , 1 and 2 , to a Remote control A/B antenna switch and switch is then connected to the Tv.
Buy the Remote Control A/B Antenna Switch at ,
http://www.mcmelectronics.com. Part # 32-4425.
http://www.saveandreplay.com. Also has the same Remote Control A/B antenna switch.
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Antenna system #2.
Also at about 20 to 25 feet or so above ground.
For reception of Digital Broadcast Tv stations/channels to the , South South East.
CHNU-DT Real UHF channel 21 , virtual number (21.1) , Religion Tv.
CKVU-DT Real UHF channel 27 , virtual number (27.1) , CITY TV.
CHNM-DT Real UHF channel 29 , virtual number (29.1) , OMNI 1.
CIVI-DT Real UHF channel 23 , virtual number (23.1) , CTV2.
K30FL-D Real UHF channel 30 , virtual number (7.1) , KIRO , CBS and RTV Retro Tv Network.
Install a Antennas Direct , DB8e UHF Bowtie Panel antenna above the Peak of the Roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the direction of , South South East.
Aim both panels of the DB8e antenna at about 178 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.
For 1 Tv connected Test reception with No antenna system amplifier.
For 1 Tv connected use No splitter.
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Here are some places to buy antennas and etc. .
http://www.saveandreplay.com.
http://www.trentondistributors.com.
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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/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) .
http://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.
The Best Practice is to install the antennas 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 building.
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The Tv Must Channel scan for the , OTA=Over The Air , Digital Broadcast Tv stations/channels , often named the ~ DTV Channels ~ Broadcast 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 in to the Tv Setup Menu and select ~ DTV Channels ~ Broadcast Channels ~ Antenna Channels ~ Air Channels ~.
Scan for channels.