There are groups of Digital Tv stations/channels in 2 directions , north/east and south.
North/East direction has NBC and CBS and PBS and Cw and Me-Tv.
The South direction has ABC and CBS and PBS and FOX and CW and Me-Tv.
To receive , NBC , CBS , ABC , will require antennas setup to receive both directions , north/east and south.
The antennas will be combined into 1 coax.
Above the peak of the roof so that the roof and house are not blocking reception to the north/east, install a AntennaCraft Y5-2-6 VHF low band antenna aimed at about 35 degree magnetic compass direction.
Also install a AntennaCraft Y5-7-13 VHF high band antenna aimed at about 35 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The 2 antennas are connected together with a HLSJ = VHF high band / VHF low band - Separator/Joiner.
Type the letters hlsj in the ,
http://www.solidsignal.com , search box.
The Y5-2-6 antenna is connected to the VHF low connection of the HLSJ.
The Y5-7-13 antenna is connected to the VHF high connection of the HLSJ.
(( WJHL-TV channel 11 CBS and Me-Tv will be received at the front of the Y5-7-13 antenna and WLOS channel 13 ABC is strong signal strength and will be received at the back of the Y5-7-13 antenna.))
The remaining connection of the HLSJ will be connected to the VHF connection of a UVSJ = UHF/VHF - Separator/Joiner.
Type the letters uvsj in the ,
http://www.solidsignal.com , search box.
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For reception of the South group of Digital Broadcast Tv stations/channels.
Install a Channel Master CM4228HD UHF antenna above the peak of the roof so the reception is not blocked by the roof and house in directions of , south/east , south , south/west.
The CM4228HD will be aimed at about 190 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The CM4228HD antenna will be connected to the UHF connection of the UVSJ.
And the remaining connection of the UVSJ will be connected a Channel Master CM3410 distribution amplifier or a CM3414 distribution amplifier.
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Install the , Y5-2-6 low band antenna on the bottom , the Y5-7-13 VHF high band antenna above Y5-2-6 and have CM4228HD on top.
Or install the CM4228HD on the bottom , the Y5-2-6 above and the Y5-7-13 on top.
Try to have about 3 feet separation between the 2 Y5 antennas and the CM4228HD can be close to either Y5 antenna.
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As always , trees and tree leaves do a good job of , multipath/reflecting , absorbing , blocking , Digital broadcast Tv reception and so do buildings and other obstructions including your own roof and house.
It is best to install antennas at a location that has the least amount to no amount of any type or kind of obstructions 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 , Digital Broadcast Tv stations/channels , often named the 'Air Channels' or 'Antenna 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 , 'Air Channels' / 'Antenna Channels'.