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We present results from a study of pp → W γ + X events utilizing data corresponding to 0.7 fb-1 of integrated luminosity at √s = 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. We set limits on anomalous WWγ couplings at the 95% C.L. The one-dimensional 95% C.L. limits are 0.49< κ γ < 1.51 and -0.12< λ γ < 0.13. We make the first study of the charge-signed rapidity difference between the lepton and the photon and find it to be indicative of the standard model radiation-amplitude zero in the Wγ system.