An antenna (or aerial) is an electrical device which converts electric power into radio waves, and vice versa.[1] It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (i.e. a high frequency alternating current (AC)) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.
You do not need a special HD digital antenna. Most UHF/VHF antennas will work. Just make sure you get one six to eight feet long. The longer the boom length the higher the gain or amplification.
http://www.channelmaster.com/Outdoor_Antennas_s/20.htm

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