I WONDER - Who Invented The Radio?

The invention of the radio involved multiple contributors. Henrik Hertz is credited with discovering the first wireless radio in the late 1800s. However, it was Italian inventor Guglielmo Marconi who is recognized as the father of radio for making practical radio sets in 1895. The first radio station began broadcasting in Pittsburgh, Pennsylvania, in 1920.

What discovery did Marconi's radio sets build upon?

What city was the first radio station located in?