We can easily remember the formula using the mnemonic 1234. Since there are two legs (di-pole), each leg is 1/4 of a wavelength (λ/4). If you use an antenna that is not resonant, then it won’t transmit as well and a portion of that radio energy turns to heat. Best practice is to transmit on the most resonant antenna available. This length is where the antenna needs to be resonant (“tuned”) on the frequency you want. Note that you cannot transmit on this frequency unless you have a Part 95 MURS radio or have a true emergency.ĭipole Antennas made for a frequency should measure 1/2 of a Wavelength (typically seen as λ/2). This frequency is in the 2-meter band (1.97 meters). Our example here is MURS 3 (151.940 MHz) which has a wavelength (λ) of 6.36 feet. Wavelength – the distance a radio wave will repeat its cycle. If you understand the theory, then you can build any kind of antenna from these principles. The Jungle or Quarterwave Groundplane Antenna is an omni-directional antenna that was designed to be field-expedient and to enhance radio communications in the dense jungle. “If you can make a dipole antenna, then you can make any antenna.” – NC Scout Background
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