Received the kit for the Multiband Fuchs antenna from QRP porjects in Germany. The English manual explains how it tunes a half wavelength at the lowest band to operate effectively on higher bands. So a 41m length of wire can be used from 80 - 10 metres.
"Tuning is very easy. The first step is, to find the point of maximum noise / loudest signal in receive. Now with a small transmitter signal, the link is switched to lowest SWR. Ready. The FUCHS is equipped with an output indicator. Only at the point of resonance, the LED glows."
Homebrew Challenges Much Like Ours: The Direct Conversion Receiver of Wes
Hayward W7ZOI and Dick Bingham W7WKR -- QST November 1968
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https://www.worldradiohistory.com/Archive-DX/QST/60s/QST-1968-11.pdf
*I was thinking about some of the challenges faced by the builders of the
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