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Does anybody know what this device is or what it is used for?

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    \$\begingroup\$ It looks like an RF power splitter to me (guesswork). \$\endgroup\$
    – Andy aka
    Commented Nov 20, 2022 at 18:54

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It's a 4-way Wilkinson power divider/combiner. It can be operated in both directions.

Have a look at a similar 8-way example and more design details on microwaves101

enter image description here

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    \$\begingroup\$ Perfect answer! I'd add that that milled housing suggests it came from some military or at least commercial-grade equipment. It also looks like some hand-tuning was done to perfect the impedance matching, as evidenced by those extra tabs soldered on just beyond the series-kludged resistors, so I'd say it was an experimental prototype. \$\endgroup\$ Commented Nov 20, 2022 at 19:40
  • \$\begingroup\$ The mulitple sections means it's a wideband Wilky, as opposed to a fairly narrowband single section version \$\endgroup\$
    – Neil_UK
    Commented Nov 21, 2022 at 15:03

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