third-harmonic is still really tempting actually. if only we could get the bandwidth where we want it...
going third-harmonic would give us way better directionality in the vertical axis and improve gain too, AND make it look even cooler by making the dipoles hilariously long. BUT it kind of wrecks the bandwidth a lot (that 400 MHz we have now would be hard to let go of) and also it seems really hard to get the front:back ratio to behave itself??
@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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