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random wire antenna
A random wire antenna is a radio antenna consisting of a long wire suspended above the ground, whose length does not bear a relation to the wavelength of the radio waves used, but is typically chosen more for convenience. 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; this type of antenna sometimes is called a zig-zag antenna. Such antennas are usually not as effective as antennas whose length is adjusted to resonate at the wavelength to be used. Random wire antennas are a type of monopole antenna and the other side of the receiver or transmitter antenna terminal must be connected to an earth ground.
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.
== Random wire and long wire ==
Often random wire antennas are also referred to as long-wire antenna. Long-wire antennas require a length greater than a quarter-wavelength (λ/4) of the radio waves (most consider a true long wire to be least one wavelength〔), whereas random wire antennas have no such constraint.〔Practical Antenna Handbook (Carr, Mc Graw Hill) - Chapter 9〕
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