The National Association of Broadcasters is located in Washington, D.C., and offers broadcasting services. It is a trade association that advocates on behalf of more than 8,300 free local radio and television stations. It serves in various industries, such as radio, television and digital broadcasting. Its public services include campaigns, national reports, public service announcement satellite feed and elections log. NAB distributes public service announcements to television stations nationwide on the third Friday of every month. It coordinates with various satellites, such as C-Band, Intelsat A8, Transponder C10, 89 degrees West, Downlink Frequency 3900 MHz and Horizontal Polarity.