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To investigate the characteristics of circularly-polarized waves as propagated through the troposphere, a field recording station has been set up at Hudson, Ohio. Continuous field intensity recordings have been made of the horizontal and vertical components as well as the circularly-polarized field over a 125-mile path from Columbus, Ohio. The results of these recordings are compared Â¿ with recordings of the propagation of plane polarized waves over the same path, as wall as over the path from Detroit, Michigan, this latter path being about 50 per cent over water. A mobile recording survey has been conducted on a radial from Columbus through Hudson, and also on the circumference of a thirtymile radius around Colwdns. An analysis of this survey has been made showing the relationship betmen the horizontal and vertical components of the circularly-polarized field. lh addition, a comparison of the propagation data from Texas is made with the data obtained in this study. This cmparison sham marked daferences in the diurnal variation i n the two regions. This work has been performed under contract betmen the National Bureau of Standards and the mited Broadcasting Company.