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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@mattblaze
And quite often it seems if they can get an AM broadcast tower just above some swampy saltwater, they will. I suspect that this gets better performance out of the radials that surround the vertical element, but I've never gotten around to asking an engineer about it. We have quite a few low-lying marshy areas with towers just inside in the Bay Area. The easiest ones to see are around the Bay Bridge and San Mateo bridge, but there's also a directional set of 3 right next to 101 in San Mateo for KZDG 1550 AM.
@spatula Yes, the ground resistance is actually the most important factor in determining mediumwave antenna efficiency. Part of the license process involves getting an extensive site survey for this.