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

submitted 1 month ago by mattblaze@federate.social to c/photography@fedia.io

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KNBR (AM 680) Antennas, Redwood City, CA, 2024

All the pixels, less risk of electrocution or falling, at https://www.flickr.com/photos/mattblaze/54131419266

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[–] gilester45@twit.social 0 points 1 month ago (1 children)

@mattblaze@federate.social I'm fascinated by the cap hat, specifically why we don't see more of them. I'd have thought saving tower height would always be welcome. I guess it's a tradeoff and the hats only make sense, given some limitation or other, at particularly large wavelengths?

[–] mattblaze@federate.social 1 points 1 month ago

@gilester45@twit.social The hats aren't as efficient as a proper length antenna; they serve mostly to increase the current flowing at the top end. And they're BIG (this antenna is so tall that you can't easily tell that the top hat is almost 50 feet across!)