The next most powerful radar telescope is Goldstone's telescopes (also part of the Deep Space Network). It's unfortunately about 20x less sensitive, and is at a

The next most powerful radar telescope is Goldstone's telescopes (also part of the Deep Space Network). It's unfortunately about 20x less sensitive, and is at a different frequency. This means it's less suited for finding and tracking relatively unknown asteroids, something Arecibo was uniquely qualified for. https://www.space.com/arecibo-observatory-loss-for-planetary-defense-asteroids https://www.space.com/arecibo-observatory-loss-for-planetary...