The Earth-Moon-Earth (EME) Communications in which Ham Radio Signal sent straight up to Moon using directional antenna making using of the moon as a passive reflector and thus some part of the radiating signal reflects back to the earth that makes it possible to have long-distance communication.
The World Radiosport Team Championship (WRTC) is a competition between two-person teams of amateur radio operators testing their skills to make contacts with other Amateur Radio operators around the world.