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- A radio network is a network system which distributes programming to multiple stations simultaneously, or slightly delayed, for the purpose of extending total coverage beyond the limits of a single broadcast signal. The resulting expanded audience for programming essentially applies the benefits of mass-production to the broadcasting enterprise. A radio network has two sales departments, one to package and sell programs to radio stations, and one to sell the audience of those programs to advertisers. Most radio networks also produce much of their programming. Originally, radio networks owned some or all of the radio stations that broadcast the network's programming. Presently however, there are many networks that do not own any stations and only produce and/or distribute programming. Similarly station ownership does not always indicate network affiliation. A company might own stations in several different markets and purchase programming from a variety of networks. Radio networks rose rapidly with the growth of regular broadcasting of radio to home listeners in the 1920s. This growth took various paths in different places. In Britain the BBC was developed with public funding, in the form of a broadcast receiving license, and a broadcasting monopoly in its early decades. In contrast, in the United States of America various competing commercial networks arose funded by advertising revenue. In that instance, the same corporation that owned or operated the network often manufactured and marketed the listener’s radio. Major technical challenges to be overcome when distributing programs over long distances are maintaining signal quality and managing the number of switching/relay points in the signal chain. Early on, programs were sent to remote stations (either owned or affiliated) by various methods, including leased telephone lines, pre-recorded gramophone records and audio tape. The world's first all-radio, non-wireline network was claimed to be the Rural Radio Network, a group of six upstate New York FM stations that began operation in June 1948. Terrestrial microwave relay, a technology later introduced to link stations, has been largely supplanted by coaxial cable, fiber, and satellite, which usually offer superior cost-benefit ratios. Many early radio networks evolved into Television networks.
- ラジオネットワークは、各地域にある民間放送のラジオ放送局同士が結成した、主に番組交換を主とする組織である。番組を送り出す局は「キー局」と呼ばれる。 日本においては、ニュースネットワークを軸に関係を強化していったテレビとは異なり、音質や番組内容の質のよい番組提供やスポンサー確保など、営業の側面から構築されてきた。このことから、AMラジオの場合、たとえ2つのネットワークのどちらか一方の加盟局で多くネット受けされている番組であっても、実態としてはむしろ、ネットワークとしての活動というよりは、単に自由な番組売買の結果と判断したほうがふさわしい場合のほうが多い（これは民放AMが1局しかない地域が多いのも一因である）。したがって、安易にネットワーク名を冠することのないよう、充分な注意が必要である。 大都市圏以外はAMラジオ・FMラジオごとに「一地域一局」というパターンが多く、AMラジオ局では複数のネットワークに加盟（クロスネット局）、FMラジオではJFNから順に単独加盟をしている場合が多い。ラジオネットワークに属さない局は独立局、もしくは独立ラジオ局と呼ばれる。ネットワークを越え、番組が放送される場合は「番組販売」として扱われる。
- 廣播聯播網，是指廣播電台以多個獨立的電台共同播出同一組節目的一種播放形式，組成的原因多半基於法令或是經營策略的考慮，在有些國家因為法令上的限制，全國性播放執照難以取得，因此電台的經營者為求擴大經營，由數名業者達成協議，共同播放同一組節目，如此一來，大的業者可以透過這樣的方式實質上兼併小的地方業者，小的地方業者也可透過這樣的方式減少製作節目的成本。
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![[RDF Data]](/statics/sw-cube.png)
