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To do it precisely you do it:

[URL unfurl="true"]https://www.hamradio.me/antennas/measuring-quarter-wave-coax-stubs-using-mfj-analyzer.html[/URL]


For example: you need 180°coax for 27.200

You measure quarter wave stub for 13.600 and it makes 1/2 for 27.200 :)