Which of the following would be a reason to use a balun in an antenna system?

The use of a balun in an antenna system is primarily to convert unbalanced signals to balanced signals. This conversion is critical because many antennas, especially dipoles, are inherently balanced, while coaxial cables, commonly used to feed antennas, are unbalanced. By incorporating a balun, you can effectively match these different types of signals, which helps to minimize issues such as feedline radiation and impedance mismatches.

This conversion enhances the efficiency and performance of the antenna system by ensuring that the signal is transmitted and received effectively without unnecessary losses. A properly matched system also contributes to the overall stability of the antenna's radiation pattern, leading to improved communication.