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--->The Amplifier is being Over Loaded with the Over the Top Strong Signal Strength Tv Transmissions from Sutro Tower.
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A over loaded amplifier will have odd and unusual effects on reception.
If part of the amplifier is not in the antenna , their is -->No<--> Type or Kind of Amplifier Built In The Antenna.
And All other parts of any type or kind of amplifier parts or componets are disconnected and removed.
And the Rabbit ears type antenna has No so called fine tuning knob/switch.
And and the rabbit ears antenna is a Plain Jane antenna.
Then install aim the indoor rabbit ears type antenna at about , 130 and 310 degree magnetic compass direction.
Here is how to aim indoor and outdoor 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.
South West ~ West windows will most likely be best for reception.
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Digital Tuners can be cleared of Non Correct channel scan information with a Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.
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Here is a , -->Plain Jane<-->Non Amplified<-->Rabbit Ears Type Indoor Antenna.
Channel Master CM4010 , Summit Source item number AN4010.
http://www.summitsource.com.
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Please answer the following questions.
Is the building the Tv is in , a , House , Town home , Condo , Apartment ,
Mobile Home , Motor home , or etc.??
What directions do windows face??
What directions do , patio / balconies face??
What floor??
How many floors??
What is the top floor of the building??