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The signals were not secret, the physical structure was not necessarily viewed in the west until satellites took pictures. Certainly the mission in all its details and expectations are still classified and therefore secret.

Pictures of the radar array show up on Reddit r/AbandonedPorn all of the time. People have climbed on top of it for pictures.

not when it was turned on though...

So secret that I booked a trip there a year ago and visited. And knew about it beforehand.