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"Richard Clark" wrote
The electric dipole moment is clearly bridged by a conductor, by definition. As such, at the interface, it must collapse completely into a current which gives rise to counter emf, the two waves cancel as a function of phase - the proof again is found in the Lambertian distribution that vanishes completely with the removal of ground (why horizontal antennas are held up in the air). The more remote the ground, the greater the variation of phase and the distribution, and yet the low angles never fully recover (the death embrace of ground is always there). Richard, would the dipole's performance thus be improved by bedding the ground with sand, and hurt by adding ground radials? Same true if the dipole was at some compromise between 1/4 wave and the desired 1/2 wave above ground? Regards, Jack Painter Virginia Beach, Va (where mostly sand exists anyway) |
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