Communication antennas are devices that transmit and receive radio waves, enabling wireless communication. They are essential for various technologies, including cell phones, television broadcasts, and Wi-Fi networks. Antennas convert electrical signals into radio waves and vice versa, allowing information to travel over distances without physical connections. Different types of antennas serve specific purposes, such as dipole antennas for basic communication or parabolic antennas for satellite signals. The design and size of an antenna can affect its performance, including range and signal quality. Proper placement and orientation are also crucial for optimal communication efficiency.