Final answer:
A radio located at a stationary site is called a base station, serving as a fixed point for transmitting and receiving signals. The base station works within communication networks and the antennas are positioned on high towers.
Step-by-step explanation:
A radio that is located at a stationary site is called a base station. This is not to be confused with a repeater, which extends the range of communication by receiving and retransmitting signals, or a portable radio, which can be easily carried by an individual, or a mobile radio, which is typically installed in vehicles. Base stations are integral parts of communication networks; they provide a fixed site for transmitting and receiving radio signals and are essential in cellular networks, radio broadcasting, and various other wireless communication systems. The antennas for these stations are often located on tall towers to ensure a clear line of sight over large areas for effective transmission.
The frequency and wavelengths of radio stations vary and are displayed on the face of a radio set. For instance, AM radio waves can navigate around large obstacles, while FM and television signals generally require a line of sight and are sent from tall structures, making FM and TV antennas smaller in size but elevated to achieve unobstructed transmission paths.