Because of the channel combinations of the Tv stations at your location , 2 antennas aimed different directions , connected on to one coax will not work well for your reception situation.
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For reception of the , south west , south , group of Digital Broadcast Tv stations channels at the front of the antenna.
And some of the north group of Digital Tv stations/channels , through/at the back angle of a antenna will be received.
Above the Peak of the Roof in such a manner that the roof and house are not blocking reception in the directions of , south west , south , north.
Install a Winegard HD7698P antenna aimed at about 214 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are some above the roof antenna mounts.
www.ronard.com/909911.html. Use the 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html. Use the #4560 eave antenna mount.
http://www.ronard.com/ychim.html. For the correct strap length measure around the chimney.
http://www.ronard.com.
Buy the ronard antenna mounts at solidsignal by typing the word ronard in the solidsignal search box or buy from ronard.
Here are some places to buy antennas and etc. .
http://www.solidsignal.com.
http://www.amazon.com.
http://www.winegarddirect.com.
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Install a Winegard HDA-100 distribution amplifier.
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Install a Levition 47690-6 , 6 way splitter.
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As always , trees and tree leaves , plants and plant leaves , have a negative effect on Tv reception , multi-path/reflections , absorbing , blocking , Broadcast Tv Reception and so do buildings including your own roof and house and other obstructions.
The best practice is to install the HD7698P antenna 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 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 the 'Air Channels' ~ 'Antenna Channels'.
Scan for channels.