The Wilson W601-0008 700-2100 Omni MIMO Antenna, Low-PIM is an omnidirectional 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.