Alas, the Arecibo Radio Telescope [http://www.naic.edu/ao/ ] in
Puerto Rico is no longer in operation due to its collapse in December 2020.
The 305-meter telescope was in service for 57 years and withstood
hurricanes, earthquakes, and tropical storms.
Engineers determined that all three of the telescope’s support
towers broke off, sending the 900-ton instrument falling onto the
NASA has proposed a lunar far-side dipole. The mother of all
dipoles is proposed as 20×20 kilometers. Yes, kilometers, about
12.42 miles by 12.42 miles of the lunar surface.
Imagine about 100,000 interlinked dipole antennas in your backyard!
NASA also proposed to build the dipole on-site with lunar materials. A frequency range of 5-40 MHz. The subject for the antenna will be focused initially on the unexplored Cosmic Dark Ages and identifying conditions and processes under which the first stars, galaxies, and accreting black holes formed. No equivalent observatory exists today on Earth.
Find out more by visiting the program page at NASA: https://www.nasa.gov/directorates/spacetech/niac/2021_Phase_I/FarView/