An Antenna is a transducer, which converts electrical power into electromagnetic waves and vice versa. An Antenna can be used either as a transmitting antenna or a receiving antenna. A transmitting antenna is one, which converts electrical signals into electromagnetic waves and radiates them.Antenna engineers involves designing and developing antennas and other communication devices. The cable is connected to the transmitter or the receiver via an antenna tuner to help catch or transmit the signals. These are available in different sizes as well as shapes.The small size antennas can be found on the roofs to watch television whereas big ones are used to capturing signals using satellites.