Radio broadcasting, a significant component of mass communication in India, commenced in two principal locations: Bombay (presently Mumbai) and Calcutta (presently Kolkata). Amateur radio clubs initiated broadcasts in Bombay in 1923. Calcutta commenced its broadcasts during the same period. These two cities spearheaded radio broadcasting in India, signaling the commencement of a pivotal era in mass media advancement.
| City | Year of First Broadcast |
|---|---|
| Bombay | 1923 |
| Calcutta | 1923 |
Consequently, the definitive response is: Bombay and Calcutta.