Radio and TV waves are detected by:

Radio and TV waves are electromagnetic waves that are primarily detected using an aerial (or antenna) and a receiver. The aerial is designed to capture these waves from the air, converting the electromagnetic signals into electrical signals. The receiver then processes these electrical signals, allowing the sound and image to be reproduced as intended by the original broadcast.

The other options listed do not serve this function. Microwave sensors are specialized for detecting microwave frequencies and are not suitable for picking up radio and TV broadcasts. Sound wave detectors are used for audio frequencies and are not capable of detecting radio waves, which are much lower in frequency. Optical fibers are used for transmitting light signals, and while they are effective for data communication, they do not interact with radio and TV waves. Thus, the combination of an aerial and receiver is the correct method for detecting radio and TV transmissions.