A pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods, used to sense the environment. The butterfly's antennae help it detect changes in its surroundings.
A device, typically a rod or wire, used to transmit or receive radio or television signals. The old television set required an external antenna to receive clear signals.
A natural ability to detect or sense something, often used metaphorically. She has a keen antenna for detecting lies.