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ABSTRACT  In order to construct accurate point sources simulations at the frequencies relevant to 21‐cm experiments, the angular correlation of radio sources must be taken into account. Using the 74 MHz VLA Low‐Frequency Sky Survey, we measured the angular two‐point correlation function,   w (θ) . We obtain the first measurement of clustering at the low frequencies relevant to 21‐cm tomography. We find that a single power law with shape   w (θ) = A θ −γ   fits well the data. For a 10° galactic cut, with all data at declinations  δ &lt; −10°  also discarded, and a flux limit of   S = 770 mJy , we obtain a slope of  γ= (−1.21 ± 0.35) . This value of γ is consistent with that measured from other radio catalogues at the metre wavelengths. The amplitude of clustering has a length of 2–6, and it is independent of the flux‐density threshold.

Clustering at 74 MHz