this post was submitted on 23 Jun 2025
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Photography

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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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[–] [email protected] 1 points 2 weeks ago (34 children)

Mediumwave (AM) broadcast radio uses lower frequencies than other modern broadcasting and so requires much larger antennas (generally getting larger and larger as the frequency gets lower on the dial). This often entails highly customized antenna designs engineered for the particular site and station frequencies. For most radio stations (FM, TV, etc), the towers are there simply to get the relatively small antennas up high, but for AM stations like KNBR, the towers generally ARE the antennas.

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

@[email protected] I was surprised that they operate in the 441m wavelength space, meaning the antenna does have to be huge. For some reason I thought commercial AM operated in a shorter band.

[–] [email protected] 0 points 2 weeks ago (1 children)
[–] [email protected] 1 points 2 weeks ago

@[email protected] Yeah. I should know better but never really thought about it.

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