An antenna is a device that sends or receives invisible waves of energy through the air, allowing radios, televisions, cell phones, and other electronics to communicate. When you listen to the radio in a car, the antenna sticking up from the roof catches radio waves floating through the air and converts them into sound from your speakers. Cell phone towers use large antennas to send and receive the signals that let you call your friends or browse the internet.

The word also refers to the long, thin feelers on insects like ants, butterflies, and beetles. These antennae (the plural form when talking about animals) help bugs sense their surroundings. A moth uses its feathery antennae to detect smells from far away, while an ant taps its antennae against surfaces to gather information about its environment, almost like touching something to learn about it.

Both meanings share the same basic idea: something that reaches out to detect or transmit information. Whether it's your phone's antenna connecting to a wireless network or a grasshopper's antennae exploring a leaf, an antenna is all about sensing and communicating with the world beyond immediate reach.