A nondirectional antenna, often referred to as an omnidirectional antenna, is a type of antenna that radiates or receives electromagnetic waves equally in all directions. Another synonym for a nondirectional antenna is an isotropic antenna, which is a theoretical antenna that radiates in all directions equally. Another term used is an all-directional antenna, and a wideband antenna is also referred to as a nondirectional antenna, as it does not radiate or receive radio signals in any particular direction. Other synonyms include a non-directional aerial, a passive antenna, a vertical antenna, and a whip antenna. Regardless of the term used, nondirectional antennas are commonly used in various applications, such as public safety, satellite communication, broadcasting, and more.