Antenna length

Dipole, quarter-wave, 5/8-wave, and full-wave loop lengths for a frequency in MHz.

Calculated in this browser. Nothing is sent anywhere.

Wire velocity factor 0.95 assumed for dipole/quarter/5-8 elements. Cut long and trim for SWR — real antennas are detuned by ground, nearby objects and feedline.

How to use

  1. Enter the frequency in MHz.
  2. Read each antenna's element length.

What it supports

0.1–30,000 MHz. Dipole and single-element lengths use a 0.95 wire velocity factor; cut long and trim with an SWR meter — ground, nearby objects, and feedline all move the real resonance.

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