Antenna baluns are devices used to balance the electrical signals in an antenna system. They are typically used to match the impedance of the antenna to the transmission line, ensuring efficient power transfer. Baluns can be made using various techniques, such as using transformers or transmission lines. Transformers are commonly used in baluns for their ability to convert signals between different impedance levels. Transmission line baluns, on the other hand, use the properties of the transmission line to achieve impedance matching. Baluns are essential in antenna systems to prevent signal loss, minimize interference, and improve overall performance.