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You don't have a signal strength problem, you have a signal quality problem.
Most likely, you've either got the antenna is what is a dead spot for that channel (move it), FM interference (install an FM filter), or electrical/electronic noise interference (much tougher).
Check your TV set's menus (and owner's manual). Look for anything related to diagnostics or antenna adjustments. Many sets do not include such a tool, so don't be surprised if yours doesn't.
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