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Greetings nleahcim,
An RCA ANT751R is a good antenna for your situation. There is healthy amount of signal available for you to work with.
A preamp would not be advised, with only 15 of coax and 1 TV you don't need amplification. What I would focus on is the location of your mounting. Are you shooting thorough a tree? I would test several different locations and see if reception stabilizes. To me it seems you are getting signal interruption rather than lack of signal.
Did you use the out of box transformer on the ANT751? Some have reported it is very cheap is performance is shoddy. On my ANT751 I replaced my out of the box transformer with a more robust unit.
The ANT751R pointed at magnetic 295 ought to be plenty to have all the major broadcasts from San Francisco.
Cheers.
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