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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 , attic , roof , building.
Some and not all Negative Effects are.
Absorbing Blocking Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice for Reliable Reception is to install antenna/s 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 , attic , roof , building.
The directions of reception are , North West , North , North East , South East.
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Install a.
http://www.antennacraft.net.
HBU55 antenna.
Aimed at 330 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 , do not trust a , cell phone , tablet and etc. compass.
Most Digital Tv's have Signal Strength Meter and some Digital Tv's also have a Signal Quality Meter.
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Install a.
http://www.antennacraft.net.
10G201 preamp.
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For 1 Tv connected use no splitter.
For 2 Tv's connected use a , Holland Electronics , HFS-2D 2 way splitter.
For 3 Tv's connected use a , Holland Electronics , HFS-3D , 3 way splitter.
Buy the , HFS-2D , HFS-3D , splitters at ,
http://www.hollandelectronics.com , or ,
http://www.amazon.com.
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Install the HBU55 antenna at about 25 or more feet above ground.
Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html. Install the , ronard(911) , 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html. Install 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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Home Depot has , 10 foot 6 inch length , 1 and 3/8 inch diameter , TOP RAIL , chain link fence , Pipe , that makes good antenna mast/pipe , the price is low at about 12 dollars.
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You have not said if any other antennas are installed.
If any other antennas/antenna systems are installed , do not connect this HBU55 antenna system to the other antenna system.