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A theoretical analysis is given for t he a mplitude and the phase chan ge of the ground wave, origin atin g from a d istant transmitter on land, as it crosses a coast lin e. Thc land and sea are assumed to be smooth, and homogeneo us with a sharp boundar." of sepa ration. Attention is focused on t he effects t hat take pl ace near the coast li ne \\'hen it. is not pel'miss ible to employ arguments based on the principle of stat ion ary phase. A lim ited cornparison is madc with the recent expcrimental work of Pressey, Ash\\'cl l, and Fowler ,

Amplitude and phase of the low-frequency ground wave near a coastline