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On top of a mountain in south Salt Lake City, Utah there are many antennas.

What are these curly ones?

enter image description here

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Looks like a vertical array of circular polarized antennas, each half element as half turnstile and half traveling wave used for the circular phasing.

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  • $\begingroup$ Circularly polarized, yes. I didn't think about that. But what do you mean about the traveling wave part? $\endgroup$ Aug 19, 2021 at 21:50
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    $\begingroup$ Traveling wave may be the wrong term. But I wasn't sure what to call a widely spaced (non-coax) phasing delay line that might be part of each antenna element. $\endgroup$
    – hotpaw2
    Aug 19, 2021 at 23:49

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