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The radiation efficiency of the wire is not affected if the antenna is worked against a resistive counterpoise (such as a poor ground) and a suitable matching scheme is used, the efficiency of the antenna system may actually increase significantly. When the length of the wire is near an even multiple of quarter-wavelengths, its feedpoint impedance may take on extreme values (thousands of ohms) due to resonance, which can cause low efficiency with popular impedance matching schemes. Actual long-wire antennas require a length greater than a quarter-wavelength (λ/4) or half (λ/2) of the radio waves (most consider a true long wire to be least one wavelength ), whereas random wire antennas have no such constraint. Often random wire antennas are also (inaccurately) referred to as long-wire antenna. They are widely used as receiving antennas on the long wave, medium wave, and short wave bands, as well as transmitting antennas on these bands for small outdoor, temporary or emergency transmitting stations, as well as in situations where more permanent antennas cannot be installed.
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Random wire antennas are typically fed at one end against a suitable counterpoise (such as earth ground).
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Due to the great variability of the (unplanned) antenna structure, effectiveness can vary wildly from one installation to another. The wire may be straight or it may be strung back and forth between trees or walls just to get enough wire into the air. When installed the wire is supported by buildings or trees using the insulators to prevent a short circuit to ground.Ī random wire antenna is a radio antenna consisting of a long wire suspended above the ground, whose length does not bear a particular relation to the wavelength of the radio waves used, but is typically chosen more for convenience. A wire antenna kit, with a coil of wire, strain insulators and a balun.
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