Antenna is a device that transmits or receives electromagnetic waves. In everyday terms, it's the thing you see on rooftops or cell phones that helps with signal reception.
The word "antenna" comes from Latin, originally meaning "sail yard" but later used to describe insect feelers.
Other meanings of "antenna" include:
1. In biology: The sensory appendages on insects' heads (咱说的触角)
2. Slang: Someone's ability to pick up on subtle signals or vibes (第六感那种)
3. In vehicles: Those rod-like things sticking out (车上那根杆儿)