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Install a New matching transformer , the Channel Master CM94444 outdoor matching transformer is often recommended.
For coax that is exposed to the outside Weather/Water , use RG-6 Coax that has the Compression Type Connectors on the ends of the coax.
Do not use coax that has the old style crimp type connectors.
Replace outside coax with New Coax.
To make Double Sure Weather/Water does not get into , coax , connections , devices.
Wrap the connections and incase the matching transformer with.
http://www.coaxseal.com.
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Aim the HBU33 antenna at about 147 degree magnetic compass direction.
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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.
To assist best reception.
Most Digital Tv's have a Signal Strength Meter and some Digital Tv's also have a Signal Quality Meter.
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When the antenna system is working at it's best.
Is/are.
K35DG ,
http://en.m.wikipedia.org/wiki/K35DG
KSWB-FOX
KUSI-Independent
KNSD-NBC
KPBS-PBS
received reliably??