It makes a sphericalcap reflector and shields from radio from the Earth and Sun. You may get something similar by putting a satellite in earth syncro orbit on t

It makes a sphericalcap reflector and shields from radio from the Earth and Sun. You may get something similar by putting a satellite in earth syncro orbit on the dark side of the moon. https://www.nasa.gov/directorates/spacetech/niac/2020_Phase_I_Phase_II/lunar_crater_radio_telescope/ https://www.nasa.gov/directorates/spacetech/niac/2020_Phase_...