How is the complete range of radio frequencies used for communication described?

The complete range of radio frequencies used for communication is described as the spectrum. The term "spectrum" encompasses all the electromagnetic frequencies, including those utilized for wireless communication, broadcasting, and other forms of transmission. It classifies and organizes frequencies into various bands based on specific characteristics and uses.

From a broader perspective, the spectrum is critical in public safety and communications because different frequency ranges have distinct propagation characteristics and applications, which can affect the effectiveness and efficiency of communication systems. This includes considerations such as range, penetration, and interference, which are vital for effective public safety communications.

The other terms, while related to the concept of radio frequencies, do not accurately describe the entirety of frequencies available. For example, bandwidth refers to the width of a certain frequency band that can be used for transmitting a signal, while a channel indicates a specific frequency or band of frequencies designated for a particular communication. The term frequency range usually refers to a specific subset of the spectrum and is more about the limits of a particular range rather than the overall collection of frequencies used in communication. Thus, the most comprehensive and suitable term is indeed the spectrum.