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Where is your antenna located? Roof? Attic?
Did you inspect your connections to make sure they are tight, and not corroded? Sometimes they come loose and, in the cold weather, shrink just enough to be only partially connected. And sometimes water gets in and corrodes them. In this case (if the coax is still good) it's easy to chop off an inch of coax and put on a new connector. And antenna baluns do go bad and are easily (and cheaply) replaced.
It's certainly possible that your pre-amp has issues, especially if mounted outside. Though, in my experience, they tend to just quit and you loose signal rather than just provide a degraded signal.
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