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For Boston, that's favorable with your existing antenna. Anything around a signal strength of 7db and lower is susceptible to atmospheric and weather conditions causing the signal to fall at times below the digital cliff resulting in loss of reception.
I have a 7db signal which is the secondary CBS in my market. Its directional translator is 55 miles out and 1000 watts which of only 400 watts is heading my way. With my Antennas Direct 91XG on my large TV I see it 99% of the time, however different TV tuners can behave differently. My 24" sharp in my study only sees KLEW 50% of the time.
Coming and going can often be the reality of signal digit signal strengths.
Cheers.
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