Contribution from radio AGNs (red) and SFGs (blue) along with their sum (green) to the ERB at various frequencies. We also compare our results with the model from Massardi et al. (2010). Data points are from Bridle (1967), Wall et al. (1970), Fixsen (2009) (see Figure 9 in Massardi et al. 2010). The red stars denote the contribution from radio AGN plus a single source with $L_{150\mathrm{MHz}}={10}^{27}\mathrm{W}{\mathrm{Hz}}^{-1}$ at z = 0.4. The shaded region represent the 5/95 boundary of radio AGN contribution when running the assignment 200 times.