The fraction of radio galaxies in the volume-limited sample (sample A, defined in Sect. 3.1) as a function of distance to the local group barycenter. The grey area shows the 90% CL, based on Poisson statistics for the number of observed radio galaxies. Since our sample probes over 90% of the volume, this uncertainty reflects the cosmic variance, rather than the statistical significance of this observation. Cen A remains the only radio galaxy up to 16 Mpc, where M 87 joins the ranks (at this distance, the number of normal galaxies in the volume-limited sample is 62).