This is a complete system, engineered to work together to combine up to eight IEM transmitters of any brand into a single helical antenna. The CP Beam helical antenna steps up an IEM system's transmitting power by nearly eight times, focusing the signal directly on your performers and not scattering the signal where it isn't needed. This allows you to use the lowest possible setting of your transmitter's output power, which greatly reduces intermodulation interference to both your wireless mics and your IEMs. An extra benefit that improves RF signal and audio quality!