[GeronL]

I'm not sure... do they have the ability to jam alien signals?

[Lonesome in Massachussets]

I'm reasonably sure it's a passive array, they listen, they don't radiate. They are involved in radio astronomy, I doubt they schedule much time, if any, for SETI.

Long baseline radio interferometry using distant (like 20 giga-LY) radio sources is the primary means of determining the Earth's orientation.