telecommunication, the term effective height can refer to the height of the center of radiationof an antenna above the effective ground level. Or in low- frequencyapplications involving loaded or nonloaded vertical antennas, the moment of the current distribution in the vertical section divided by the inputcurrent. For an antenna with symmetrical current distribution, the center of radiation is the center of distribution. For an antenna with asymmetrical current distribution, the center of radiation is the center of current moments when viewed from points near the direction of maximum radiation.
Federal Standard 1037Cand from MIL-STD-188
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