The WilsonPro 461053 Enterprise 4300R is a commercial-grade, in-building cellular signal amplifier from the WilsonPro Enterprise/Pro line, the same family of bidirectional boosters used to extend carrier coverage through steel, concrete, and low-reception buildings. It is built for rack-mount. Like other units in this line it's designed for professional installation, pairing an outside donor antenna with an inside distribution antenna over low-loss coax to rebroadcast a stronger signal indoors.