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The Arecibo Observatory has proposed a phased array of small dishes mounted on a circular platform ~300 meters in diameter (or potentially multiple smaller platforms) which would be angled in various directions to provide reasonable sky coverage.
7. Arecibo recently opened the Arecibo Observatory Data Archive, which allows folks to obtain data organized by project. About 1800 proposals are listed, although not all of those have data available because not all of the observatory's data has been transferred to its new home at the Texas Advanced Computing Center.
Another, more distant hope is for the Next Generation Arecibo Telescope (NGAT) to be built at the site. After the 305-metre dish collapsed, some researchers who had used the site proposed NGAT, an instrument that would combine a 314-metre-wide platform with a swarm of 9-metre dishes on top of it.
It is a "delay-Doppler" image, using 12.6 cm, ~500 kW radar broadcasts transmitted by Arecibo. The round-trip light time was about 135 minutes. Because Arecibo has limited steering away from the zenith (<19.7 degrees) max Saturn was only available to the dish for 166 minutes even under ideal conditions.
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Source: Reddit. update 2: Sadly, parts of the dish have collapsed, several cables have snapped, and the Arecibo radio telescope is now decommissioned and demolition has been recommended because it is now too unsafe to do anything else. NSF begins planning for decommissioning of Arecibo Observatory’s 305-meter telescope due to safety concerns.
Radio telescope dishes built into fixed surface depressions. At least two very large, single dish telescopes have been built into naturally occurring depressions in local rock: Arecibo at 18.3° N and FAST at 25.7° N latitudes. Both telescope designs have large primary focus structures (small buildings where people can work) suspended high ...
After the commissioning phase that began in 2016, the Five-hundred-meter Aperture Spherical Telescope (FAST) started full operations in 2020. With the loss of the Arecibo Observatory later that year, FAST quickly became even more important than expected. For a number of astronomical objects, it is the only telescope capable of detecting them.
The closer you are to the equator, the more of the sky you can see. Cold air is drier than warm air. Cold air at 20% relative humidity is drier that warm air at 20% relative humidity. Dust, pollen and persistent high level cirrus haze are problems. Incidentally, the Tibetan plateau is an excellent observatory site.
Since you are asking about single craters I assume this question is about using a crater as a natural pre-form for a single, large dish antenna like Arecibo Observatory and FAST. On the Moon with no atmosphere or ionosphere nearly the whole sky is available for good signal, but as you move away from the current zenith position (i.e. "straight ...