We present a realistic modeling of the dipole component of the projected sky distribution of NVSS radio galaxies .
The modeling relies on mock catalogs generated within the context of \Lambda CDM cosmology , in the linear regime of structure formation .
After removing the contribution from the solar motion , the mocks show that the remaining observed signal is mostly ( 70 % ) due to structures within z \lesssim 0.1 .
The amplitude of the model signal depends on the bias factor b of the NVSS mock galaxies .
For sources with flux density , S > 15 mJy , the bias recipe inferred from higher order moments is consistent with the observed dipole signal at 2.12 \sigma .
Flux thresholds above 20 mJy yield a disagreement close to the 3 \sigma level .
A constant high bias , b = 3 is needed to mitigate the tension to the \sim 2.3 \sigma level .