This report presents a comparison in free space of input impedance and radiation efficiency characteristics of two type's of radiating structures Which have been proposed for use as air¬borne VLF antennas:namely, the single. "trailing-wire antenna" and the side-loaded "transmission-line antenna."nFrom the theory of side-loaded transmission-line antennas derived by R. W. Kulterman, input impedance, radiation efficiency, and side-load voltage drops are calculated for examples of three types of transmission-line antennas. Some general comparisons are made between the efficiency and impedance characteristics of trailing-wire antennas and transmission-line antennas. Some advantages and disadvantages of both types of antennas are given.
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