These antennas are popular as they cover many bands and are easily erected. Especially with high power, RF in the shack can be an issue.
At the end of a halfwave the impedance is high so they are usually fed via a wideband transformer to bring the impedance closer to 50 ohms. Wideband transformers are usually 1:49 or similar. On their harmonics the radiation pattern can be very odd.
They can be useful antennas, but are a compromise.
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