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S~~';:~l numerical examples are presented for radio propagation over a three· s ec tion pa th. These are based on formulas which were derive d earli e r [Fu rut su, 1957a, 1957b, 1959, 1963; Furutsu , Wilkerson, and Hart mann, 1964J in whic h the he ight and the e lec trical properties of each sec tion may be d iffe ren t. F irs t the path is assumed to be a land-sea-Iand path and a sea-land-sea path wi th no he ight difference; the atten uation using this model is obtained both for the fl a t earth a nd the sp he rical earth and the val ues are compared to show th e asy mptoti c approach of these two value s at short distances. Second , the e ffec t of the he ight a nd width of a mesa is illu s trated and the att e nuat icn valu es a re co m· pared to the va lues obtained whe n the obs tac le is a knife-edge of the same he ight. Next the effec t of vary ing the rece ive r he ight is prese nted when the pat h is eit he r a sealand-sea path or a la nd-sealand path . F inall y, examp les of the atten ua tion caused by both a channel and an is land having bluffs are given whi ch illus trate the recove ry effect as we ll as the diffract ion loss in th e vic inity of the coastlines.

Calculated curves for groundwave propagation over inhomogeneous earth with pronounced topographical features