FM transmitters are devices that allow you to broadcast audio signals over a specific frequency range. They are commonly used in radio broadcasting, but can also be used for other purposes, such as wireless audio transmission and personal listening devices.
Many ways to boost the signal strength of an FM transmitter. One common method is to use an external antenna. Antennas can be either omnidirectional, which broadcasts the signal in all directions, or directional, which focuses the signal in a specific direction. The type of antenna you need will depend on your specific needs.