telecommunications media: Quick Facts

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The Information Architects of Encyclopaedia Britannica

Photos

radio wave dish-type antennas

Cutaway illustrations of a multipair cable and a coaxial cable show internal structures, including twisted pairs and shielding, with arrows indicating current flow and labeled electric and magnetic fields.

Multiple tall telecommunications towers with red lights stand on a hilltop at dusk in Phoenix, Arizona, silhouetted against a darkening sky.

cell phone tower; microwave tower

attenuation spectrum

Diagram illustrating the commercially used bands of the radio-frequency spectrum, with labeled sections for VLF, LF, MF, HF, VHF, UHF, SHF, and EHF. Each band shows example uses such as maritime radio, AM/FM radio, television, mobile phones, satellite communications, and radio astronomy, along with a scale for wavelength and frequency.

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