Antenna is an ElectroAcoustic device that perform the transmission of Electrical signals.
"Rabbit ears" dipole antenna for television reception
Cell phone base station antennas
Parabolic antenna by Himalaya Television Nepal
Yagi antenna used for mobile military communications station, Dresden, Germany, 1955
Turnstile type transmitting antenna for VHF low band television broadcasting station, Germany.
Folded dipole antenna
Large Yagi antenna used by amateur radio hobbyist
A mast radiator antenna for an AM radio station, Chapel Hill, North Carolina
Wikipedia has related information at Antenna (radio)