A TV antenna is a device that captures over-the-air television signals, allowing viewers to watch broadcast channels without a cable subscription. These antennas can be installed indoors or outdoors and come in various shapes and sizes, depending on the type of signals they are designed to receive. Most TV antennas work by picking up signals transmitted from local broadcast towers. The quality of reception can vary based on factors like distance from the towers, terrain, and obstructions such as buildings or trees. Many people use antennas to access free channels, including local news, sports, and entertainment.