What does all this antenna wavelength stuff mean?

Getting to the bottom or the top of antenna wavelength designations.
Some of the antennas mentioned in this video:
Sirio 1/4 wave ground plane:
amzn.to/3T6MBbk
Shakespeare Big Stick:
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Sirio 5/8 wave vertical:
amzn.to/49OiMBT
Solarcon 99:
amzn.to/3wpmDXA
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