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Minuteman missile silos used an interesting hardened UHF antenna. What kind of antenna is this? Does anyone have a drawing with a cross section?

Hardened UHF Antenna

Edit:

Jay Moore added a picture to a different type of hardened antenna, the truncated cone in the foreground. Different Antenna Jay's antenna might be an annular slot antenna, if it is an antenna and not another hatch. In that case, the lighter gray circle would be a dielectric. I don't think these are the same antenna types.

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    $\begingroup$ Some information about the UHF comm systems can be found here: minutemanmissile.com/uhfradio.html $\endgroup$ – Jay Moore Jun 20 at 13:25
  • $\begingroup$ In case anyone wonders, the MF antenna described on the page is an array of crossed folded dipoles. See here for more information: apps.dtic.mil/sti/pdfs/AD0607419.pdf $\endgroup$ – Olg Jun 20 at 17:08
  • $\begingroup$ Welcome to Amateur Radio! While this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. $\endgroup$ – Glorfindel Jun 20 at 17:09
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    $\begingroup$ I’m going to make a random guess that the top photo contains (at least) 2 antennas. The annular slot on the cone is UHF or VHF, the tan circle around the cone is the annular slot of an HF antenna. $\endgroup$ – hotpaw2 Jun 21 at 20:41

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