The Distributed or Branch Feed curtains are considered to be classical HRS type antennas. There are 4 mathematical model types of ITU HRS type HF antennas.
Distributed or Branch Feed curtain arrays are called HR type curtain arrays. The H and R standing for Height and Rows. When they are steerable, they are sometimes called HRS arrays, the S representing "steerable".
An HR 4/3 would be an antenna 4 elements high and 3 elements wide. If it was an HRS 4/3, it would be a steerable array of the same element configuration.
The HRS antenna type was not originally intended for voice and music broadcasting. However, the directional properties of this antenna type were ideal for voice broadcasting—and the design is now pervasive in international broadcasting by the 1950s. As far back as the mid-1930s, Radio Netherlands was using a rotatable HRS antenna for global coverage.
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