  We explore the large to moderate scale anisotropy in distant radio sources
using the TGSS ADR1 catalog. We use different measures, i.e. number counts, sky
brightness and flux per source, for this study. In agreement with earlier
results, we report a significant excess of clustering signal above the angular
scale of roughly $10$ degrees (i.e. $l\lessapprox 20-30$). We find that some
survey areas have a systematically low/high flux and argue this may be the
cause of the observed signal of excess power at low multipoles. With mocks we
demonstrate the effect of such large scale flux systematics and recover TGSS
like excess clustering signal by assuming $20\%$ flux uncertainties over $\sim
10^\circ \times 10^\circ$ size patches. We argue that that TGSS at this stage,
i.e. TGSS ADR1, is not suitable for large scale clustering measurements. We
find that the measure, flux per source, shows evidence of isotropy for all
multipoles $l > 2$ despite the presence of systematics in the data.

Cosmology and Nongalactic Astrophysics