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Loose the amplifier, first off. You don't need it and it's an invitation to more trouble.
After that, move the antenna, several times, if necessary. As it happens, you've got the antenna in a dead spot for that particular stations. Signals , even from the same tower, are not homogeneous.
If there are obstacles in front of the antenna such as buildings, trees, etc, be patient and persistent. Try to find a spot that gives you the best available view towards the horizon in the direction of Sutro.
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