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This paper briefly mentions some of the most important applications of ultra-high frequencies in the field of aeronautics and describes one of them in some detail. This is the ultra-high-frequency radio range, a short-wave counterpart of the conventional long-wave radio range which now provides directional guidance along the Federal Airways of the United States. A direct comparison, is made between the two by means of graphs based on signal recordings made during flight tests of a standard long-wave range and an ultra-high-frequency range operating under the same conditions and at the same location near Pittsburgh, Pa. The advantages of ultra-high frequencies over low frequencies are strikingly illustrated.