<human>:  What is the difference between a monopole and a dipole antenna?
<bot>: The primary difference between a monopole and a dipole antenna is that a monopole consists of a single conductor, while a dipole consists of two conductors connected to a central point. A monopole is designed to radiate in only one direction, while a dipole's radiation pattern is omnidirectional. Monopoles are typically used in low frequency applications, while dipoles have been used in higher frequency communications.