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The C5 may not be enough antenna for the weak NBC signal inside the attic. Did you experiment with different areas of the attic? As high as possible in the attic is crucial in my attic for seeing weaker signals. Any chance you can mount it outside? If not, you will need a lot more gain & directionality.
My minimum recommendation would be a Winegard YA-1713, but it still may need to be outside to make NBC reliable. Unfortunately attic reception is a crap shoot, especially with weak VHF.
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