How do signal repeaters enhance radio communication?

Signal repeaters enhance radio communication primarily by boosting and retransmitting the signal. In radio communication systems, the distance and range of signals can be limited due to various factors such as terrain, obstacles, and propagation conditions. When a signal is received by a repeater, it amplifies the signal strength and retransmits it to extend its coverage area.

This process significantly improves the overall communication ability by allowing signals to reach distances that would otherwise be unattainable, ensuring that messages can be sent and received over longer ranges and across obstacles. The function of repeaters is crucial for maintaining effective communication in environments like mountainous regions, urban landscapes, or other challenging terrains where direct line-of-sight may not be possible.

By contrast, other options such as reducing the number of channels, improving battery life, or limiting communication do not correctly describe the primary role of signal repeaters in enhancing radio communication.