For thirty years, astronomers have dreamed of using Refsdal's method to provide a direct and unassailable value for H0 and may be within reach of attaining this goal. Radio astronomy is central to this effort as it is proving very effective at finding candidate gravitational lenses, has contributed crucial redshifts, can provide the accurate, high resolution maps that are necessary to obtain good models of the deflecting potentials and should eventually yield crucial time delays. In order to measure the Hubble constant accurately, it is necessary to measure the time delay even more accurately and to subject the lens model to several independent tests. It may also be necessary to model the action of intervening galaxies. Current progress will be reviewed and some of the phenomenological challenges will be critically examined.