Radio waves
Broadcast TV uses radio waves of VHF originally, now UHF frequencies to carry sound and image information.
Televisions do not transmit signals, they receive them. The question sounds like a school question and therefore it would not be beneficial to simply answer the question entirely. Televisions receive...
The first person to transmitt and reproduce a television image was Scotman John Logie Baird.
Corbis Bettmann