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People will often purchase antennas in order to transmit or receive radio waves. There are two main types of antennas. Omni-directional antennas radiate in all directions, while directional antennas focus their radiation in one direction. Antennas can be used to receive radio transmissions on electronic devices such as televisions and radios, but can also be used to transmit radio waves from sources such as television and radio stations. For use with commercial electronic products, antennas can usually be purchased at electronics stores or stores that sell products that use antennas.
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