  We investigate the contribution that a local over- or under-density can have
on linear cosmic dipole estimations. We focus here on radio surveys, such as
the NRAO VLA Sky Survey (NVSS), and forthcoming surveys such as those with the
LOw Frequency ARray (LOFAR), the Australian Square Kilometre Array Pathfinder
(ASKAP) and the Square Kilometre Array (SKA). The NVSS has already been used to
estimate the cosmic radio dipole; it was shown recently that this radio dipole
amplitude is larger than expected from a purely kinematic effect, assuming the
velocity inferred from the dipole of the cosmic microwave background. We show
here that a significant contribution to this excess could come from a local
void or similar structure. In contrast to the kinetic contribution to the radio
dipole, the structure dipole depends on the flux threshold of the survey and
the wave band, which opens the chance to distinguish the two contributions.
