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The situation is most likely , Multi-Path , Tv Signals Bouncing All Around Off Of Trees and Tree Leaves When Wind is Blowing and Moving Water When Wind is Blowing.
Use a More Directional Antenna that Limits the Reception of Multi-Path Tv Signals coming in at different angles to the antenna.
Install a ,
http://www.channelmasterstore.com.
CM4228HD antenna aimed at about 241 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.
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For Reliable Reception May Need to Have Antenna Higher.
To Better Avoid Reception That is Just Skimming Across Top Of the Moving Waves Of Water.
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A Antenna System Amplifier is Not Required.