This paper describes t he design and the performance of a multiple-wire delta antenna developed for use with high output impedance, vert ical-incidence ionosphere sounding equipment. Graphs are presented showing the terminal impedance of this antenna over the separating frequency range (1 to 25 megacycles) , using various lengths of open-wire transmission line. The results of pattern measurements using model tech niques are given , showing the expected radiation characteristics of the full-scale antenna. A practical test of the comparative merits of the antenna is described in which ionosphere records obtained by the u se of this antenna are compared with those obtained by the use of a larger antenDa developed p reviously.
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