Antenna, also called Aerial, component of radio, television, and radar systems that directs incoming and outgoing radio waves. An antenna is a device that is made out of a conductive, metallic material and has the purpose of transmitting and/or receiving electromagnetic waves, usually radio wave signals. The purpose of transmitting and receiving radio waves is to communicate or broadcast information at the speed of light. Advantages of antenna are the signal strength increases & Power wastage is reduced.The range of an antenna depends on a number of factors like frequency of the signal & the gain of the antenna. A higher gain antenna will have a longer range.