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If you didn't pick up anything without the amp, something is either defective (antenna or coax or installation) or the actual antenna's location is blocked or otherwise impaired. Your chart says your signals, including KPIX, are about a million times stronger than the minimum of what should be needed for reception, even with a 100' coax run.
What is in the direction of of Sutro as seen by the antenna? Are you in a well, behind a building or trees, etc???
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