> some steering is possible by moving the receivers, or antennas, around a platform suspended by cables high above the dish. The cable that broke this week was not one of the main support cables but one of several auxiliary ones added in the 1990s to stabilize the platform when a large new antenna, known as the Gregorian dome, was added.

If anyone is curious, in this article there is a picture where you can see the suspended platform with the "Gregorian dome":

https://www.npr.org/2020/08/12/901920638/puerto-ricos-arecib...