The following descriptions are taken from the corresponding websites:

Public Radio International (PRI)
PRI is an independent, not-for-profit corporation and is public radio's leading source for innovative programming, providing diverse voices and global perspectives for the public airwaves.

Public Broadcasting Service (PBS)
PBS, headquartered in Arlington, Va., is a non-profit media enterprise owned and operated by the nation's 354 public television stations. A trusted community resource, PBS uses the power of noncommercial television, the Internet and other media to enrich the lives of all Americans through quality programs and education services that inform inspire and delight. Available to 99 percent of American homes with televisions and to an increasing number of digital multimedia households, PBS serves over 75 million people each week.

Corporation for Public Broadcasting (CPB)
CPB is a private, non-profit corporation that was created by Congress in 1967. The Corporation is not a government agency. It promotes public telecommunications services (television, radio, and online) for the American people. CPB invests in more than 1,000 local radio and television stations... their services, their programs, and their ideas. These CPB-funded stations reach virtually every household in the country.

Educational Communications Board (ECB)
ECB is a state agency committed to ensuring that public radio and television programs and services are made available throughout Wisconsin, and that these programs and services reflect and respond to the educational and cultural needs of the state's residents. This is accomplished through the activities of the ECB and through collaboration with entities involved in educational and cultural initiatives whose purposes can best be served through telecommunication.

National Public Radio (NPR)
NPR is an internationally acclaimed producer and distributor of noncommercial news, talk, and entertainment programming. A privately supported, not-for-profit membership organization, NPR serves a growing audience of 26 million Americans each week in partnership with more than 800 independently operated, noncommercial public radio stations. Each NPR member station serves local listeners with a distinctive combination of national and local programming.

Association of Public Television Stations (APTS)
APTS is a nonprofit membership organization established in 1980 to support the continued growth and development of a strong and financially sound noncommercial television service for the American public. APTS provides advocacy for public television interests at the national level, as well as consistent leadership and information in marshaling support for its members: the nation's public television stations. APTS' affiliated organization, APTS Action, Inc., provides legislative advocacy and seeks grassroots and congressional support.

University Licensee Association
The mission of the University Licensee Association (ULA) is to assist public broadcasting stations licensed to colleges and universities in efforts to fulfill individual missions and goals through the sharing of ideas within the association and to speak for the special needs and interests of the licensees during times of national planning and decision-making.