What device would you use to extend the communication range of a radio signal?

A repeater is specifically designed to extend the communication range of a radio signal by receiving a signal and then retransmitting it at a higher power or to a different frequency. This device effectively acts as a bridge between two separate radio units, allowing them to communicate over greater distances than would otherwise be possible.

When a radio signal travels over a long distance, it can weaken or become distorted due to various factors like obstacles, terrain, and atmospheric conditions. A repeater amplifies the original signal, ensuring that it retains its strength and clarity, which is crucial in maintaining effective communication.

In contrast, while a transmitter is used to send out signals, it alone does not increase the range of signals that have already been transmitted. A receiver is essential for capturing incoming signals but does not enhance or extend their range. An antenna can improve reception and transmission quality but does not function like a repeater in terms of amplifying and relaying signals over long distances. Hence, a repeater is the ideal device for extending the communication range of a radio signal.