Not surprisingly that such antennas are called cage antennas. Instead of increasing the thickness of dipole wires, they can be made in the form of a cage made of galvanized steel rods or tubes, galvanized steel cable, or copper antenna wire. However, if we increase the thickness of dipole wires, the antenna can become usable over a larger bandwidth without re-tuning. For example, a 5/4-wave dipole antenna has a gain about 3 dB higher than that of a half-way dipole and therefore it is often used in various applications.ĭipole antennas are resonant, which means they can be used only on a single frequency. The most common dipole length is half the wavelength. Any dipole antenna consists of two identical elements in the form of metal rods with the feedline between them. Dipole antennas are used alone and as parts of dipole arrays. The dipole antenna is the simplest and most widely used in radio communications since the beginning of the RF technique. The photo was taken in 1973, four years after the radio telescope was put into operation. This photograph shows the broadband cage dipoles (or Nadenenko dipoles) of the Ukrainian radio telescope UTR-2, which was built in the USSR.
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