An experiment was performed during the years 1962 through 1964 in which direction of arrival data were collected on pulse signals received over a 450 km east-west path. In order to determine the effect that traveling ionospheric disturbances (TIDs) had on these data, a “corrugation” model was proposed. The corrugation model assumes that TIDs can be treated as if they were moving cylindrical sinusoidal perturbations on the ionospheric eflecting surface. Lateral deviations in the experimental data of the type predicted by this model were found to be quite common. Variations in the detected TIDs as a function of time of year were found to be consistent with the “seasonal effect” studied by Munro in 1958, Jones in 1969, and Davies and Jones in 1971.