By the time we have a radio telescope on the far side of the Moon, I assume we can just lay a couple hundred kilometers of fiber to the nearest settlement. The border of the disk, from Earth's perspective, is prime scientific real estate - the border of the area that's always visible is not too far from the area that's never visible (and, therefore, shadowed from our radio noise).
Maintenance crews can do quick hops to the telescope, while their offices are always in contact with Earth.
Maintenance crews can do quick hops to the telescope, while their offices are always in contact with Earth.