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Install the antenna above the peak of the roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , north west , west , south south east .
Aim the UHF at about 261 degree magnetic compass direction.
Here is how to aim antennas ,
www.kyes.com/antenna/pointing/pointing.html
Use a Real and Actual magnetic compass to aim antenna.
Digital tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
To clear tuner do Double Rescan
www.wchstv.com/DoubleReScanAlert.pdf
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To improve reception of the Tv stations to the , north west and south south east , turn the UHF antenna more to the , north west , with out loss of KTSF.