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Assuming you are using Ch 3 or 4, and either RG59 or RG6 coax, you will have a loss of 2.4 dB per 100 ft (that's the way they rate it) with RG59, 1.5 dB loss per 100 ft with RG6. So at 20 ft either type, RG59 or RG6, signal loss would be insignificant, less than a half a dB.
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