Now is the time to put Antennas Direct DB8e UHF antenna claims , to the test.
Aim both panels at about 228 degree magnetic compass direction.
Also install a Winegard YA1713 VHF high band antenna aimed at about 228 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
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Do not use the HD4400 and Y5713 antennas you have now.
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For your reception situation the following information is more then 100% true.
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 the antennas at a location that has the least amount to no amount of obstructions in the directions of reception including your own roof and house.
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For your Digital Tuners Reception Equipment , getting the cleanest signal possible is Very Important.
The Digital Tuners Reception Equipment you have does not tolerate multipath and signal interferences very well.