1, Verify the C2 is oriented and aimed correctly.
2. Move the antenna several feet (up, down, left, right forward, backward) and try again. Repeat as needed. Do not drill any new holes until you have identified a new location that is satisfactory. Sometimes it takes as little as half a foot, sometimes several feet, sometimes several yards.
"Dead" spots can readily be formed by seemingly random physical items in or near the signal path and can affect either single of several channels at or near a single frequency. Moving the antenna can put it into a different spot without the convergence of undesirable signal disturbances.
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