antenna — A metal rod, wire, or other structure that receives or transmits radio or television signals

a technician adjusts a large metal television antenna while holding a signal meter device. The technician rotates the antenna's metal rods toward distant transmission towers visible on the horizon. Immediately after the adjustment, the signal meter shows stronger reception bars lighting up. The technician gives a thumbs up to a family member looking out from a nearby window. The family member waves back excitedly as clear television reception is restored inside their home. a metal structure that receives radio and television signals being properly aligned for optimal transmission