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Interestingly enough, I only get KGO (7/7.1,2,3 - Sutro Tower) and KNTV (12/11.1 - Mt. San Bruno) plus a few foreign language channels without the power inserter (total of about 35). I get a total of 70+ channels with the inserter.
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That's expected when using an amplifier. Turn the power off and you can expect to get very little signal through. In some cases, strong local signal may be powerful enough to get through the shielding of the TV tuner or coax shield.
If you are interested, we can suggest other antenna options...