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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 ...
The most common, 300 Ω twin-lead ribbon cable, was once widely used to connect television sets and FM radios to their receiving antennas. 300 Ω twin lead ribbon cable for television installations has been largely replaced with 75 Ω coaxial cable. Multiple forms of parallel wire line are used in amateur radio stations as feedline for balanced ...
The dangling wire may run directly into the back of a radio, but more often a 'T' antenna is fed by a cable attached near where the dangling wire comes to ground. Additionally, the antenna requires a low resistance ground system, normally centered directly below the bottom of the 'T'.
Coaxial cable is used as a transmission line for radio frequency signals. Its applications include feedlines connecting radio transmitters and receivers to their antennas, computer network (e.g., Ethernet) connections, digital audio (), and distribution of cable television signals.
This is the type of antenna used in most portable AM broadcast receivers (other than car radios): The standard AM antenna is a loop of wire wound around a ferrite rod (a "loopstick antenna"). The loop is resonated by a coupled tuning capacitor, which is configured to match the receiver's tuning, in order to keep the antenna resonant at the ...
The radials at the antenna base provide a proper ground plane for the types of radio antennas used for long wavelengths. These "half dipole" antennas require grounding or earthing wires in order to function well, since the virtual image of the antenna electrically reflected by the mirror-like ground system is an essential part of the operation ...
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