BAND OF FREQUENCIES, a continuous range of fre quencies extending between two definite frequencies. In radio communication, frequency bands of various widths are allocated or assigned by international agreement for use by certain services such as, broadcasting, transoceanic, and ship-to-shore communi cation. The width of the frequency band required for use by a given radio station depends upon the type of transmission, for example, whether high or low-speed telegraphy, telephony, fac simile or television.