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www.thoughtco.com/invention-of-radio-1992382

In the early 1900s, the development of radio was hampered by the lack of an efficient detector of electromagnetic radiation. It was De Forest who provided that detector. His invention made it possible to amplify the radio frequency signal picked up by antennae. This allowed for the use of much weaker signals than had previously been possible.

en.wikipedia.org/wiki/History_of_radio

The superhet simplified radio receivers by doing away with the need for several tuning controls. It made radios more sensitive and selective as well. FM gave listeners a static-free experience with better sound quality and fidelity than AM. Wavelength (meters) vs. frequency (kilocycles, kilohertz)

en.wikipedia.org/wiki/Radio

Radio communication. Information such as sound is converted by a transducer such as a microphone to an electrical signal, which modulates a radio wave produced by the transmitter.A receiver intercepts the radio wave and extracts the information-bearing modulation signal, which is converted back to a human usable form with another transducer such as a loudspeaker.

www.madehow.com/Volume-7/Radio.html

The radio frequency amplifier is designed to amplify the signal from a radio broadcast transmitter. The mixer takes the radio signal and combines it with another signal produced by the radio's variable frequency oscillator to produce an intermediate frequency. The variable frequency oscillator is the tuning knob on the radio.

science.howstuffworks.com/innovation/inventions/who-invented-the-radio.htm

Scientific work in radio technology was heating up too. Two men in particular, Serbian-American scientist Nikola Tesla and Italian physicist Guglielmo Marconi went head-to-head in what would become the race to invent the radio. But more than 100 years later, ask any two people who invented the radio and you're likely to get two different answers.

www.reference.com/history/radio-invented-dd383e7a5eb0c1f7

An Italian named Guglielmo Marconi invented the radio in 1895 as a means of transmitting information using wireless radio waves. He developed the technology, which he called the wireless telegraph, while experimenting at his father's country estate.

www.personal.psu.edu/jtk187/art2/radio.htm

The devastation of Britain made its citizens look for an outlet in radio entertainment. People enjoyed listening to the music, plays and discussion that the BBC played. During the 1960s with the expansion of radio to FM more programs were played and local BBC stations opened up across England.

www.reference.com/history/first-radio-invented-5d078c4999eb6306

The first radio was initially called the "wireless telegraphy," and a complete functional model was built by Guglilmo Marconi in 1895. Several other inventors laid the groundwork for the invention including Heinrich Rudolf Hertz, Nikola Tesla, Amos Dolbear, Reginald Fessenden and William Crookes.

www.history.com/topics/inventions/guglielmo-marconi

The radio signal broadcast from Poldhu, Cornwall, was as powerful as Marconi’s team could make it—at full power, the equipment sent out sparks a foot long. ... (1856-1943) made dozens of ...

www.encyclopedia.com/.../electrical-engineering/radio

The radio frequency amplifier is designed to amplify the signal from a radio broadcast transmitter. The mixer takes the radio signal and combines it with another signal produced by the radio's variable frequency oscillator to produce an intermediate frequency.