Loop antennas are a type of radio antenna that consists of a loop of wire or metal, which can be circular, square, or rectangular in shape. They are used to transmit and receive radio waves, and their design allows for a compact size, making them suitable for various applications, including portable and indoor use. Loop antennas can be resonant at specific frequencies, enhancing their efficiency in those ranges. These antennas work by creating a magnetic field when an alternating current flows through the loop. This magnetic field interacts with incoming radio waves, allowing the antenna to pick up signals. Loop antennas are often used in amateur radio, broadcasting, and wireless communication systems due to their directional properties and ability to reduce noise.