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Curtain arrays were originally developed during the 1920s and 1930s when there was a lot of experimentation with long distance shortwave broadcasting. The underlying concept was to achieve improvements in gain and/or directionality over the simple dipole antenna, possibly by folding one or more dipoles into a smaller physical space, or to arrange multiple dipoles such that their radiation ...
The verticals are the radiators and function as a minimal two-element curtain array, similar to a bobtail curtain. The structure is shaped like the Greek letter Π (not to be confused with the similar-looking half-Loop antenna described above).
Sterba curtains are modest-gain single-band curtain array antennas. They are named after Ernest J. Sterba, who developed a simple shortwave curtain array for Bell Labs in the 1930s. [1] Sterba curtain arrays are described in William Orr's Radio Handbook. There are multiple feed arrangements for the Sterba curtain arrays, as with HRS type antennas.
A 20-meter-long T²FD antenna, covering the 5-30 MHz band. The Tilted Terminated Folded Dipole (T²FD, T2FD, or TTFD) or Balanced Termination, Folded Dipole (BTFD) - also known as W3HH antenna - is a general-purpose shortwave antenna developed in the late 1940s by the United States Navy.
The United States Kurilian bobtail population hovers around 100. Thanks to their scarcity, expect to pay as much as $3,000 for a purebred. 6. Minskin: A Breed Both Petite and Hairless.
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JordanLuca designers Jordan Bowen and Luca Marchetto surprised guests at their fall/winter 2025 Milan Fashion Week show by getting married on the runway.
Qatar Airways’ Qsuites are technically business class, but they might as well be first. Passengers can choose from a single, twin, double, or quad suite, depending on how many people they’re ...