“Dreams aren’t weightless things, they have a mass,” Charles L Fairbanks Junior tells us, as he fantasises about becoming an astronaut despite growing up in Nowheresville. First performed in 2006, Al Smith’s Radio uses the moon landing as its centre of gravity, but it isn’t just the fiftieth anniversary of this triumph of American engineering that makes it worth a revival. “Pride and protest – they’re lucrative things,” we hear from Fairbanks Jnr. “The worse …