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• PCS is similar to cellular and ESMR in that it will operate on a "cell site" systeni, will use a central control point, will use sector cell configurations, will employ whip and panel antennas on monopoles and buildings, will reuse frequencies, and will use coverage and capacity sites. It will be different in that it will use digital technology, will require more sites, and its sites will have smaller radii. Paging Although paging is not addressed as an individual technology in this report, it is included in this discussion because it serves over 40 million users across the United States. Paging antennae are typically placed at lower elevations and at greater densities than antennas of other wireless communications systems. It is expected that paging companies will need forty to fifty transmitters (containing one omnidirectional antenna each) for each five to seven mile radius in order to provide service to its current and future customers. This is similar to the geographic dispersion requirements of the PCS technology. Paging companies do not typically construct their own facilities. Instead, most rent space at ' existing communications facilities sometimes known as multi-user sites. Multi-user sites that are located on building tops are an ideal location for paging facilities because paging companies have a great need for low-elevation sites. Due to the increasing demand for pagers, cities should expect conditional use permit applications for paging systems to increase. For technical characteristics of paging,please see the PCS column in Table 2. Concluding Notes on Technological Aspects of Wireless Communications Technology The largest similarity between the three forms of wireless communications discussed in this section is that they all function on a network of interconnecting cell sites. As these technologies evolve in response to increasing consumer demand for wireless communications services, providers will develop cell sites with smaller geographic radii, place antennas at lower heights, and install more antennas per square mile than in the past. Their common goal is to integrate facilities into existing community structures by building rooftop or building-mounted facilities, by designing fiberglass shrouds and creative screening, and by encouraging architecturally integrated and visually sensitive designs. The largest difference between these technologies, on the other hand, is in their form of signal transmission. Cellular is currently the only system using the analog technology, but is in the process of incorporating, if not converting to, the digital technology. The following table summarizes the technological and regulatory aspects of the three systems. Portions of the table that have not been described in this section of the report can be found in succeeding sections and in Appendix 3, which addresses licensing requirements by the Federal Communications Commission. 19