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KNBR (AM 680) Antenna, Redwood City, CA, 2024
Very tall pixels at https://www.flickr.com/photos/mattblaze/54131419266
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this post was submitted on 13 Nov 2024
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Photography
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@mattblaze@federate.social how does the capacitance hat work?
@iris@neuromatch.social Oh god, it's complicated.
The basic idea is that the radiated current in a vertical antenna approaches zero at the end, and so is not fully efficient. By extending radials outward, you're allowing additional current to flow to the end of the vertical section by providing a capacitive path to ground (between the radials and the ground).
Modeling this is not for faint of heart.
@mattblaze@federate.social that was a surprisingly intuitive description of something I definitely am not prepared to understand.