• Matt Blaze@federate.socialOP
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    27 days ago

    For much of the 20th century, the backbone of the AT&T “Long Lines” long distance telephone network consisted primarily of terrestrial microwave links (rather than copper or fiber cables). Towers with distinctive KS-15676 “horn” antennas could be seen on hilltops and atop switching center buildings across the US; they were simply part of the American landscape.

    Most of the relay towers were simple steel structures. This brutalist concrete platform in San Jose was, I believe, of a unique design.

    • Matt Blaze@federate.socialOP
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      27 days ago

      The San Jose Oak Hill Tower is unique in a number of ways. This particular concrete brutalist design appears not to have been used anywhere else; it seems to have been site-specific. It sits atop an underground switching center (that was partly used for a military contract), which explains the relatively hardened design.

      Today the underground switch is still there, owned by AT&T, but the tower space is leased to land mobile and cellular providers. The old horn antennas at top are disconnected.