Mobile phones and music players with FM radio functionality often utilize the headphone cable as an antenna due to space constraints preventing the inclusion of an internal antenna. This is a common design feature in devices lacking dedicated internal components for radio reception. Essentially, the wired headphones act as a substitute antenna, enabling FM radio capabilities. The cable’s length and material contribute to its effectiveness in receiving radio signals. This method allows manufacturers to include radio functionality without increasing device size. Users can therefore repurpose older headphones to improve FM radio reception on compatible devices. The practice highlights a resourceful solution to a technical limitation in portable electronics.