Radio antennas are devices that transmit and receive radio waves, which are a type of electromagnetic radiation. They convert electrical signals into radio waves for broadcasting and vice versa for receiving. Antennas come in various shapes and sizes, depending on their specific use, such as for AM radio, FM radio, or television signals. The effectiveness of a radio antenna is influenced by its design, height, and location. For example, taller antennas can reach further distances, while certain shapes can enhance signal strength. Antennas are essential for communication systems, including cell phones, Wi-Fi, and satellite communications.