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{{Short description|Formula for calculating signal to noise ratio}}{{one source|date=February 2018}}Relative directivity factor (RDF) is a figure of merit for radio receiving antennas.WEB,weblink Lee Strahan, Low Band Receiving Antenna Comparisons, 16 February 2018, - WEB,weblink Rudy Severns, Comments on the WD8DSB Terminated Bow-Tie RX Antenna, 2016-12-20, 16 February 2018, It is the antenna gain in the forward direction divided by the gain in all other directions. It is also called the signal to noise improvement factor (SNIF).WEB,weblink Receiving Antenna Comparison Chart, Lee Strahan, Hi-Z Antennas, Culver, OR, 16 February 2018,

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