Passive DAS solutions work best in buildings up to 500,000 sq ft and rely on signal.
Passive Distributed Antenna Systems (DAS) amplify signal from a "donor" location–usually on the roof of the building–and rebroadcast the signal inside the building. The donor signal is amplified by a bi-directional repeater, which is connected to a network of passive components, including coaxial cable, splitters, couplers, and antennas.