Nonuniform sources affect the calculation of transfer functions in the electromagnetic induction problem. Modeling the source field in terms of a number of two-dimensional sheet currents with different current intensity distributions can determine the degree of this effect. The results show little source effect for either the Schmucker (1970) or Cochrane and Hyndman (1970) formulation of the transfer function calculations. However, for distant sources with small angular spread there is some skewing of the induction arrows for both formulations. The perturbation arrows, when vectorially combined, outline the spatial extent of the conductivity anomaly, especially the quadrature-phase arrow.