Homebrew vertical antenna 40m band - To determine how much tubing we will need, we have to figure out how long a quarter wave is at forty meters . Using λ/4 (feet) = 246/f (MHz) and then converting the fraction of a foot which remains to inches, we get λ/4 = 33,10 inches for a center frequency of 7,265 MHz. Any center frequency can be chosen by placing that frequency in place of f in the formula.
This homebrew vertical antenna 40m band from Edy Karsono (YC2YIZ) , this antenna also work for 15m band, beside 40m band. Edy used MFJ analyzer to measure the SWR.
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