I admit that it's difficult because there's no scale. The device is only about 3cm on a side.

@telescoper no idea. All that metal made me think water cooler but there looks to be fine wires from the connections rather than tubing….

@telescoper a bit of radio-telescope, something something coaxial something waveguide something amplifier.

@telescoper Something with analog TV reception? Maybe connected to a signal booster?

@telescoper Definitely RF electronics, maybe a (pre) amp or switch? Maybe combining several antennae?