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2. Citizens band radio - Wikipedia

   en.wikipedia.org/wiki/Citizens_band_radio

   Typical center-loaded mobile CB antenna. Note the loading coil, which shortens the antenna's overall length. 27 MHz is a relatively long wavelength for mobile communications, and the choice of antenna has a considerable impact on the performance of a CB radio. A common mobile antenna is a quarter-wave vertical whip.

3. CB radio in the United States - Wikipedia

   en.wikipedia.org/wiki/CB_radio_in_the_United_States

   The antenna may not be more than 20 feet (6.1 m) above the highest point of the structure it is mounted to, or the highest point of the antenna must not be more than 60 feet (18.3 m) above the ground (47 CFR 95.408(c)) if installed in a fixed location. [4] CB radios must include AM or SSB modulation and may include frequency modulation. [5]

4. Personal radio service - Wikipedia

   en.wikipedia.org/wiki/Personal_radio_service

   Due to the sheer size of Russia and the remoteness of many Russian communities, CB radio is an important resource. Russian CB operators and clubs have installed several simplex repeaters on mountaintops or the roofs of high-rise apartment buildings to increase communication range of low-powered mobile CB radios.

5. Antenna (radio) - Wikipedia

   en.wikipedia.org/wiki/Antenna_(radio)

   Typical center-loaded mobile CB antenna with loading coil. It is possible to use simple impedance matching techniques to allow the use of monopole or dipole antennas substantially shorter than the ⁠ 1 / 4 ⁠ or ⁠ 1 / 2 ⁠ wave, respectively, at which they are resonant.

6. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   The category of simple antennas consists of dipoles, monopoles, and loop antennas. Nearly all can be made with a single segment of wire (ignoring the break made in the wire for the feedline connection). [citation needed] Dipoles and monopoles called linear antennas (or straight wire antennas) since their radiating parts lie along a single ...

7. Mobile radio - Wikipedia

   en.wikipedia.org/wiki/Mobile_radio

   A mobile radio must have an associated antenna. The most common antennas are stainless steel wire or rod whips which protrude vertically from the vehicle. Physics defines the antenna length: length relates to frequency and cannot be arbitrarily lengthened or shortened (more likely) by the end user.