Physical device for sending or receiving radio waves, used in broadcasting, communication, and radio astronomy.
A TV antenna is standing on the roof.
My smartphone's antenna is broken, so the signal is weak.
information-gathering tool; sensing method
Figurative extension: a person, network, or method used to pick up information, trends, or public opinion, like a metaphorical antenna.
He has his antennae out across the industry.
We use social media as an antenna to gather consumer feedback.
We put up a TV antenna on the roof.
She always keeps her antenna up for the latest information.
He's very perceptive when it comes to fashion trends.
That rumor caught on my radar.
receiving antenna; receiver antenna
planar antenna