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KGO is broadcast on real channel 7. KNTV is broadcast on real channel 12. Both channels are in the high VHF band. The DB-4 does not offer much performance below the UHF band.
The CS-5 is specifically designed for high VHF operation. KGO tends to be a 'tough get'. I'd risk being accused of overkill and add a Winegard YA1713. merge the signals from each antenna with a UVSJ (UHF / VHF Signal Joiner).
Increased antenna height will usually improve your situation, particularly if it results in clearing obstructions. You are already enjoying LOS (line of sight) conditions so I doubt you would notice any major change in signal levels.
An amplifier is used to overcome loss in cable and splitters that are connected to the output of the amplifier. Amplifiers do not receive signal from the air, that's the job of the antenna. Your TVFR indicates that you should have enough signal without amplification... enough to drive four to eight sets.
Install an antenna designed to cover the channels of interest and you'll have solved the problem.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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