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The theory for t he diffraction of spherical electromagnetic waves by a finitely conducting spherical earth was developed from Maxwell's equations by Watson [1918] and the intricate computation details were later worked out by van del' Pol and Bremmer [1936] as the now classical seri es of residues. Two aspects of this computation present considerable difficulty, especially at low frequencies: (1) The calcu lation of t he height-gain factor which takes account of an elevated transmitter and/or recciver. (2) The evaluatio n of the spccial roots, r=r., of Riccati' differential equation,

On the diffraction of spherical radio waves by a finitely conducting spherical earth