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Lesson 3: 'Sending a Signal: Antennas' this lesson will show you how to decipher the antennas radiation pattern schemes provided by antenna vendors, and how to choose the right antenna for your network. It will also guide you through the various accessories that can be added to the antenna itself (attenuator, amplifiers, lightning arrestors) to tune its signal, while providing you the information you need to make sure that your installation respects the local regulations.