Which of the following can result from poor matching between a feedline and an antenna?

Poor matching between a feedline and an antenna can lead to signal distortion. When the impedance of the feedline does not match the impedance of the antenna, it can cause reflections of the radio frequency energy traveling along the feedline. These reflections can mix with the outgoing signal, leading to interference and distortion. Such distortion can result in a degraded signal quality, making it difficult for receivers to correctly interpret the transmitted information.

In contrast, a proper match is critical as it ensures maximum power transfer to the antenna and minimizes issues such as standing waves, which can negatively affect overall performance. The other outcomes listed, including increased signal strength, decreased SWR (Standing Wave Ratio), and improved efficiency, typically are associated with a good match rather than poor matching.