the feedpoint impedance is basically chaos at third harmonic, hah
@diodelass i've had excellent luck running 3rd harmonic on a 40m vertical, the impedance isn't chaotic at all, but will always be higher than what you want it to be. probably entirely inappropriate for VHF and up.
@mngrif for a high-element-count yagi-uda, isn't impedance being too high the least of your worries? for yudas, it's usually too low, and we have gamma matches and stuff to keep the SWR under control.
our simulation applet thinger just shows a pretty bumpy landscape for reactance in the frequency domain for third-harmonic antennas, and the bandwidth is like a fifth of what it is for a fundamental-mode antenna.
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