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Repeaters-Case 1: good signal outside, poor signal inside (usually occurs in urban areas)
In the case of a building, where the external signal is good and the internal signal is bad, the tower is usually close by and the building itself is the cause of the internal signal degradation, hence, a "high gain low power repeater is adequate". The attenuation (separation) of the outside signal and inside signal is caused by the building structure itself and it is almost always enough to provide the attenuation required between the two antennas to prevent oscillation. The building environment, both outside and inside is always stable and will not change from time to time or day to day, therefore when a repeater system is set up and working in this fixed environment it will stay working and reliable. The same cannot be accomplished in a vehicle which moves and the signal level changes both outside and inside constantly, hence a booster (wired amplifier) is required in this environment.
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