The RA4000B/W from AKG is an active wide-band omnidirectional antenna designed for use with the IVM4 wireless monitoring system. The RA4000B/W effectively boosts RF signal and minimizes noise and drop-out during long cable runs, remote antenna / receiver mounting, etc. It can be used indoors or outdoors, and has a rugged, water-resistant case with a BNC input for connecting to your system.