Horn antennas are a type of directional antenna that consists of a flared metal structure, resembling a horn. They are designed to radiate or receive electromagnetic waves efficiently, making them useful in various applications, including radar and satellite communications. The shape of the horn helps to focus the radio waves, enhancing the antenna's gain and directivity. These antennas operate over a wide frequency range and can be used in both transmitting and receiving modes. Their simple design allows for easy construction and adjustment, making them popular in research and development settings. Horn antennas are often used in conjunction with other devices, such as feed antennas and waveguides, to improve overall performance.