DAS (Distributed Antenna System) is a network of antenna nodes installed throughout a building that increases cellular signal coverage within the structure. The carrier’s cellular signal from outside is not simply “boosted”, it is actually rebroadcast throughout the facility, which requires specific agreements to be in place with the carrier(s) of choice (AT&T, T-Mobile, Verizon, etc.). When designed correctly, a DAS will greatly enhance the reception of cell phone service in areas that would otherwise be a dead spot within the building.