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1. Metal siding (if a gable), TechShield shingles, radiant barrier insulation are the worst offenders.
2. Trees or anything else directly in the signal path will reduce the reliability of any forecast as they can cause very severe effects to happen to the incoming signals. You will need to do a careful site survey to see how clear of a signal path you have available in the required direction(s) is available in order to estimate your odds.
3.
a. All of your major networks, including PBS which is on that heading, transmit from a tower farm on the other side of Calaveras Lake. That will be your primary aiming direction.
b. CW comes from the north-northwest and operates on VHF 5. I'd be surprised if you didn't need "special" measures" to get it.
c. ION comes from a non-standard direction and probably will require "special measures" to assure reception.
4. Good, probably won't be able to use an amp due to very strong locals (if they're on the air).
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