You'd build an array (see e.g. VLA mentioned in the article or SKA), and it is much easier to combine the data from an array if everything isn't flying around and so there are varying distances between the antennae.
Not for radio telescopes, but how is the current state of optical interference? Would it help if we didn't have to use adaptive optics to compensate for atmospheric turbulence (and have subtly different images at the different telescopes)?
