The WilsonPro 301126 Mini Magnet Mount Cellular Antenna is a magnet-mount donor or distribution antenna built for use with Wilson/weBoost cellular signal-booster systems, used either as the outside donor antenna that picks up the carrier signal or as an inside distribution antenna that rebroadcasts the amplified signal into a room or vehicle. It's sized and connectorized to match the signal-booster kit it's ordered alongside.