The radio luminosity (νL_ν) function of extra-galactic radio sources at different frequencies. Right: 1.4 GHz from NVSS (δ >+−40) and 843 MHz from SUMSS (δ <+−30,  | b |+> 10). Left: the 1.1 GHz sample includes sources from both surveys by scaling to this frequency using the mean spectral index of α =+−0.6. For νL_ν > 10³⁹+erg s^-1, the luminosity function for radio galaxies with a jet or lobe morphology (open diamonds) is similar to full sample, while below this scale the contribution from starforming galaxies becomes clear.