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Greetings Blueox,
NBC and PBS are so strong they ought to come in with a paperclip on the back of your TV's 75 ohm connector. So, an early thought is that you are dealing with unpredictable variables that happen in attics or there is a system issue. Generally, attic installations are not suggested due to the detrimental affects on the signals you are trying to receive. Think of a cheese grater, in a manner of speaking, that is what a attic installation does to incoming signals. It weakens it and forces it to pass through solid matter. Additionally, attics open up potential problems with household interference.
What brand of antenna do you have in the attic? If you don't know please attach a picture. Since it predates the digital transition, it may not be appropriate for you today and the frequencies many stations moved to.
I'll stop at that and await your reply.
Cheers.
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