Listening: Antennas

Gap-fill exercise

Watch the video and fill in all the gaps. Then hit "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. Note that you will lose points if you ask for hints!
An antenna is a vital of any communication system which is used at both the transmitting end and the receiving end. An antenna is basically a conversion and is made of a long . At the transmitting end, it electrical energy into electromagnetic waves and then them into free . At the receiving end, it receives electromagnetic waves and then them into an electrical signal which acts as for the receiver. Antennas are basically of two types: a dipole antenna and a dish antenna. A dipole antenna is omnidirectional and used for the of radio waves, a dish antenna is a directional antenna used typically in radars and communication.

(Video in American English at: https://www.youtube.com/watch?v=iszFnJcNhwM).