Category Archives: dipole

Modelling a 40m Dipole at Various Heights

Last time we looked at the performance of a 40m dipole at 7.5 m or 3/16 wavelengths high. We discovered that its DX potential was limited but the high angle radiation made it useful for NVIS service. Now we will look at the change of performance as we increase the height of the antenna up […] Continue reading

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Modeling a 40m Dipole at Low Height

Varying the height of an antenna above ground affects many of its characteristics, among which are its feed impedance, its gain, the angle above the horizon at which maximum gain occurs, and the length of the elements for resonance. We will model a 40m dipole and investigate its performance at 7.5m, 10m, 15m. 20m, 30m […] Continue reading

Posted in Antenna, Antenna Design, antenna modeling, Antenna Modelling, Antenna Simulation, Antenna Theory, dipole, EZNEC, low height antennas, NVIS, Teaching | Tagged , , | Comments Off on Modeling a 40m Dipole at Low Height