  We present extensive radio observations of SN 2003L, the most luminous and
energetic Type Ic radio supernova with the exception of SN 1998bw. Using radio
data, we are able to constrain the physical parameters of the supernova,
including the velocity and energy of the fastest ejecta, the temporal evolution
of the magnetic field, and the density profile of the surrounding medium. We
highlight the extraordinary properties of the radio emission with respect to
the supernova's normal characteristics within optical bands. We find that
although the explosion does not show evidence for a significant amount of
relativistic ejecta, it produces a radio luminosity which is comparable to that
seen in the unusual SN 1998bw. Using SN 2003L as an example, we comment briefly
on the broad diversity of type Ic properties and the associated implications
for progenitor models.
