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KNBR (AM 680) Antenna, Redwood City, CA, 2024 (fedia.io)

submitted 2 weeks ago by [email protected] to c/[email protected]

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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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[–] [email protected] 2 points 2 weeks ago (1 children)

@[email protected] how does the capacitance hat work?

[–] [email protected] 2 points 2 weeks ago (1 children)

@[email protected] 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.

[–] [email protected] 1 points 2 weeks ago

@[email protected] that was a surprisingly intuitive description of something I definitely am not prepared to understand.