Cosmic rays and neutrinos with energies sensibly expressed in Joules
per particle have become the subject of considerable interest.  Cosmic
ray fluxes at these energies are low, and detectors with areas of
thousands of square kilometers are needed.  The existence of these
ultrahigh energy cosmic rays implies the presence of a related flux of
neutrinos generated by interactions with the cosmic microwave
background. These neutrinos have not yet been detected, because a
volumetric aperture of about 100 km^3 sr yr is required. Radio
frequency techniques offer an economical approach to obtaining the
large collecting power required to make progress on these problems.  I
will review the recent progress made in radio detection of ultra-high
energy cosmic rays and neutrinos, and the prospects for the first
detection of the neutrino flux by a balloon payload viewing neutrino
interactions in the Antarctic ice sheet.