  Supernova 2001ig in NGC 7424 has been observed with the Australia Telescope
Compact Array at ~2 week intervals since its discovery, making this the
best-studied Type IIb radio supernova since SN 1993J. We present radio light
curves for frequencies from 1.4 to 20 GHz, and preliminary attempts to model
the observed behaviour. Since peaking in radio luminosity at 8.6 and 4.8 GHz
some 1-2 months after the explosion, SN 2001ig has on at least two occasions
deviated significantly from a smooth decline, indicative of interaction with a
dense circumstellar medium and possibly of periodic progenitor mass-loss.
