I can’t help wondering whether the metamaterial approach to antenna design pioneered by and now being manufactured by http://kymetacorp.com for telecommunication applications wouldn’t work equally well for radio astronomy … particularly in the lunar environment discussed.

Because it eliminates the need for the complex engineering and construction involved in large, maneuverable parabolic reflectors, an antenna of any size could be assembled relatively inexpensively on the lunar surface.

Such a project could even start small, adding additional panels as budgets permitted. Multiple antennas, together with their precision steering and linking systems, would no longer be required.