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During an IS-mon th period in 1952 and 1953, t ransmission loss measurements at 41S megacycles were m ade over a 134-mile p ath between Cedar R apids, I owa, and Qilin cy, Illi nois. Continu ous r ecordings m ade simultaneously at severa l receiving a ntenna heights from 30 to 665 feet yield ed information on diurn al and seasonal variations in both the hourly m edian bas ic t ransmiss ion loss a nd in height gain . These data are compared to p redictions made using t he m ethod d evelop ed by Rice, Longley, a nd Norto n a nd a re found to be in good agreement, particularly at t he lower a ntenn a heights. An a nalysis of the correlation of short-term signal level variations observed at horizontall y and ver tically spaced antennas is described .

An analysis of propagation measurements made at 418 megacycles per second well beyond the radio horizon (a digest).