How do you appreciate the use of reflection of light by a concave mirror in making of TV antenna dishes? (AS6)

Light rays coming from very distant areas are considered as parallel rays. When parallel light rays are incident on the concave mirror, they are converged at the focus of the mirror. Antennas are used for communication and they use electromagnetic waves to communicate. So electromagnetic waves coming from satellites or other dish antennas located at long distances act as parallel waves and are incident on the TV dish antennas (concave mirror) and gets reflected towards focus. At the focal point, some circuit is present to absorb electromagnetic energy and converts the signal into voltage.