Structure formation predicts numerous dark matter (DM) subhalos hosted by Milky Way-type galaxies. If DM is composed of heavy self-annihilating particles, up to a few subhalos are expected to be detectable with Fermi-LAT as faint, non-variable, moderately extended gamma-ray sources without conventional counterpart in other wavelengths. Searches in the first Fermi catalog have yielded one promising candidate, 1FGL J0030.7+0724, whose steady high-energy flux can plausibly be explained by DM annihilation. Except for a hint at a blazar scenario, multiwavelength searches and follow-up observations in the X-ray (Swift-XRT) have so far failed to provide a convincing identification. However, as a DM subhalo, it should manifest itself as a moderately (<0.5 deg) extended radio source (synchrotron emission of final state electrons), with a total flux of up to 100 mJy and a peak brightness between 0.3 and 1.0 mJy/beam for the ATCA in H168 configuration at 2.3 GHz. We propose testing this possibility by observing a 20' field around 1FGL J0030.7+0724 for 24 (3 x 8) hours at 2.3 GHz with the ATCA in the H168, 750D, and 6C configurations.