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What is this metal panel under power lines?

I was hiking around the Berkshires in western Massachusetts yesterday, and came across this metal panel where some power lines were crossing a ridge:


![Image alt text](https://electrical.codidact.com/uploads/SBNf4qYcJigyy4HQnmcmr1ax)

![Image alt text](https://electrical.codidact.com/uploads/tfWNyQjpeLDHnq7TfXhYy4bH)

![Image alt text](https://electrical.codidact.com/uploads/7Rw2TiuJTjPFXm4HCuUX36ZQ)

The panel is a few meters wide, and appears to have no electrical connection to it.  It cost someone some money to put up there, so there must be a real (profitable) purpose.

A flat metal panel like that would reflect microwaves.  I notice it is facing slightly down.  Is it possible that it is aligned just right to bounce a microwave signal from some tower I couldn't see down to something in the valley below?  I think the physics would work, but I've never heard of such a thing, and never seen anything like this before.