Description: Business Band Basics Part 1 VHF and UHF Industrial Business Radio Service FCC Part 90 Land Mobile, Bloomberg Business News Live, Business Class Radio at Walkie Talkie Prices? (Retevis RB85), On-Farm Two-Way Radios - Midland GMRS vs. Business Band
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Radio broadcasting is a unidirectional wireless transmission over radio waves intended to reach a wide audience . Stations can be linked in radio networks to broadcast a common radio format , either in broadcast syndication or simulcast or both. Audio broadcasting also can be done via cable radio , local wire television networks , satellite radio , and internet radio via streaming media on the Internet . The signal types can be either analog audio or digital audio .
In 2009, there were 3,494 radio broadcasting stations in the United States.
The earliest radio stations were simply radiotelegraphy systems and did not carry audio. For audio broadcasts to be possible electronic detection and amplification devices had to be incorporated.