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If your C4 has the older "black box with silver flat combiner bars", the circuit board may be cracked causing intermittent or no reception. Call customer service at 877-825-5572 for a free warranty replacement.
I see you're still putting your antennas in the attic then comparing their reception to the antenna up on the roof. The observation that the antenna on the roof is working far better than the much more capable antennas when stuffed into the attic should tell you what you need to do.
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