  We discuss the implications of new relations between black holes' masses,
X-ray luminosities and radio luminosities, as well as the properties of the
next generation of radio telescopes, for the goal of finding isolated accreting
black holes. Because accreting black holes have radio-to-X-ray flux ratios that
increase with decreasing luminosity in Eddington units, and because deep
surveys over large fields of view should be possible with planned
instrumentation such as LOFAR, radio surveys should be significantly more
efficient than X-ray surveys for finding these objects.
