What primary environmental advantage does placing radio telescopes on the far side of the Moon offer scientists?

It offers an unparalleled environment of radio silence by shielding Earth transmissions.

The far side of the Moon provides an extraordinary environment for radio astronomy, often described as the quietest spot in the inner solar system for such instruments. This is because the physical mass of the Moon itself acts as a highly effective shield, blocking all direct radio frequency transmissions originating from Earth, including terrestrial radio, television, and cell signals. This shielding eliminates significant electronic noise that pollutes observations made closer to or on the near side, enabling scientists to study the universe at extremely low radio frequencies with unprecedented clarity.