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Antennas also known as aerials, convert radio waves into electrical signals, and electrical signals into radio waves, when connected to a transmitter or receiver they allow you to transmit signals through the air. Antennas can be Omni-directional or Directional, Omni-directional antennas radiate in all directions, whereas directional antennas such as Yagi Arrays are designed to radiate the majority of their power in a specific direction, this is useful if you know the location of the other antenna.

The size and design of an antenna is specific to the frequency range of signals that it will be transmitting or receiving, ensure that you choose an appropriate antenna for the frequency that you are working with. Also ensure that you only transmit on frequency bands that are publicly available for use in your region, various countries have differing laws on this matter.