How do you say radio in German?

Answer 1

"Radio", "Rundfunkempfänger", "Hörfunkgerät" is the term you are looking for if you a referring to a normal receiver of public broadcasts, or listening to to them.

If it is in the context of communication radio networks such as police or CB radio,

then the word you are looking for is "Funk".

The name for the apparatus used for this purpose is called a "Funkgerät".

to work in radio = im Rundfunkarbeiten

radio presenter = Rundfunkmoderator; Hörfunkmoderator; Radiomoderator

radio waves = Radiowellen; Funkwellen; Rundfunkwellen

radio-controlled = ferngesteuert; ferngelenkt