10+ Efhw Antenna Length Calculator. For 27 mhz, the formula 468 / 27 = ~ 17.33 feet of 12 or 14 awg copper. Learn how to use the efhw antenna calculator to determine the ideal length for your antenna based on the desired frequency.

Clear the form to make new entries I explain the basics of the end fed half wave (efhw) antenna, and how i calculate the lengths of my antenna for my targeted bands. For 27 mhz, the formula 468 / 27 = ~ 17.33 feet of 12 or 14 awg copper.

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