From radio communications phrase dating from the 1950s. The first five referred to a rating of signal clarity, the other to reception strength.
"five-by-five." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/five-by-five>.
five-by-five. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/five-by-five
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