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Terrestrial and satellite radio service providers transmit radio programming via the open airwaves, cable networks, and communications satellites. They differ in terms of cost, coverage and capabilities. Some terrestrial and satellite radio service providers offer nationwide or regional coverage. Others serve a more limited geographic area such as a state, province, city, or county. Terrestrial radio service provides use land-based antennas and antenna systems for two-way radios, cellular telephones, personal communication systems (PCS), and microwave applications. A terrestrial radio infrastructure uses telecommunications hardware such as filters, amplifiers, duplexers, combiners, multi-couplers, power supplies, surge suppressors, and waveguides. Satellite radio service providers use one or more communications satellites and repeaters. Typically, these repeaters are located in urban areas where tall buildings or tunnels may interfere with line of sight (LOS) transmissions.

Terrestrial and satellite radio service providers differ in terms of capabilities. There are three basic types of terrestrial radio service providers: conventional, digital, and trunking. Conventional terrestrial radio uses analog, voice-only communications over a limited geographic area. Digital terrestrial radio is designed for voice and data networks with digital signaling, simulcasting, and multicasting. Trunking systems offer a wider calling range, faster channel access, improved security, and higher talk capacities. In the United States, military and emergency service personnel use a digital cell phone system called terrestrial trunked radio (TETRA). There are two major bands for commercial transmission: AM radio and FM radio. Specifications for terrestrial and satellite radio service providers include communication type and call type. Communication types are specified as analog or digital, voice or data. Call types include: conference, broadcast, group, and emergency calling.

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Engineering Web: Terrestrial and Satellite Radio Service
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Satellite Telephone Service, Communications, & Satellite...
Satellite Communications Radio/ Terrestrial Wireless
WiMAX - Wikipedia, the free encyclopedia
from unrelated providers, they are unlikely to be affected by the same service outage.
Voice over Internet Protocol - Wikipedia, the free...
For the service of the same name, see Comcast Digital Voice.
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