Note that FAST was built by China alone, SKA is an international collaboration but without US involvement and NOEMA does have a partnership agreement for data a

Note that FAST was built by China alone, SKA is an international collaboration but without US involvement and NOEMA does have a partnership agreement for data access with the university of Michigan, but is operated and payed for by IRAM, a collaboration between France, Germany and Spain. Meerkat (at the top of the list) is also a radio telescope and while it is not build solely by South Africa and Germany, I have not heard of any US involvement that goes beyond US citizens hiring on at Hartrao or Cape Town. And in the last few years NSF has not just stopped funding Arecibo Observatory, but also Greenbank Observatory. (But they were more successful in finding their on funding and staying operational.) And while the planetary radar at Arecibo was one of a kind, and something that simply no other facility has right now, it is not the only food thing about AO. The huge collecting area and the low noise receivers were actually rather good at finding faint signals. Networks of dishes shine when it comes to resolving power, but they have their own drawbacks such as poor coverage of the u-v plane or the inability to image extended faint objects.