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2. Curtain array - Wikipedia

   en.wikipedia.org/wiki/Curtain_array

   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 ...

3. Sterba antenna - Wikipedia

   en.wikipedia.org/wiki/Sterba_antenna

   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.

4. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   The second wire connects directly to the ground system instead of connecting to feedpoint as the first wire does. Adding the second wire raises the efficiency of the monopole by 4×, [citation needed] and correspondingly raises the feedpoint impedance, giving the added benefit of making impedance matching to standard coaxial cable somewhat easier.

5. Random wire antenna - Wikipedia

   en.wikipedia.org/wiki/Random_wire_antenna

   Often random wire antennas are also (inaccurately) referred to as long-wire antennas.There is no accepted minimum size, but actual long-wire antennas must be greater than at least a quarter-wavelength (⁠ 1 / 4 ⁠ λ) or perhaps greater than a half (⁠ 1 / 2 ⁠ λ) at the frequency the long wire antenna is used for, and even a half-wave may only be considered "long-ish" rather than "truly ...

6. dbx (noise reduction) - Wikipedia

   en.wikipedia.org/wiki/Dbx_(noise_reduction)

   The logo represents both the company and its noise reduction system. dbx is a family of noise reduction systems developed by the company of the same name.The most common implementations are dbx Type I and dbx Type II for analog tape recording and, less commonly, vinyl LPs.

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