theatrical feature films and some variety of local programming – such as news programs (ranging from as limited as hourly news updates to long-form newscasts, usually airing in prime time and, in some cases, at midday), children's programming or sporting events – to fill their broadcast schedules. Because of the available population reach of the region, most mid-sized and smaller media markets often had only the basic three network-affiliated stations (either in the form of three standalone affiliates or a primary-secondary structure in which one or two stations carried programs selected among the schedules of two or all three major networks), with imported network affiliates often serving as default outlets where one or more networks were not available locally. Early community antenna television (CATV) systems were restricted from retransmitting distant signals to communities no more than approximately from the closest signal, which was a detriment to many small communities, especially sparsely populated areas of the Western United States, that were too distant from any receivable signal. As CATV system capacity increased from three channels to five during the early 1950s, several communities in the Western U.S. began incorporating CATV systems using microwave relay systems that made it possible to retransmit broadcast signals over great distances. In September 1956, Columbia Television Co. in Pendleton, Oregon began using a microwave relay unit operated by Inland Microwave Co. to import three Spokane, Washington television stations, ABC affiliate KREM-TV (channel 2, now a CBS affiliate), CBS affiliate KXLY-TV (channel 4, now an ABC affiliate) and NBC affiliate KHQ-TV (channel 6), to its subscribers. Building on this, other cable and CATV systems in smaller municipalities and rural areas sought a foothold by "importing" broadcast television signals from larger nearby or distant cities for their customers, extending their reach beyond their normal coverage area (in the case of network-affiliated stations, this was to improve reception into areas that could not adequately receive the station's signal, whether within or at the edge of the contour, even with an outdoor antenna). Anxious for more viewers, the stations assisted by relaying their signals by wire or microwave transmission. Within a few years, many other microwave-capable CATV system operators began to import out-of-market television signals based on program offerings they thought would appeal to their subscribers. Except for areas that were far enough out of a signal's reach to make this an unviable option, these systems selected major-market independent stations