Antenna Splitter/Combiner Kit includes two adapters that can be used as one-input, two-output or two-input, one-output passive antenna splitter/combiners for UC4, SLX4, ULXS4, ULXP4, U4S, U4D, UR4S and UR4D receivers. It splits an incoming signal into two outgoing signals or combine two incoming signals into one signal. Each kit includes two UA221 splitter/combiners, four coaxial cables, and attaching hardware. Splitter/combiners are designed for use with UA400 1/4 wave UHF antennas, UA820 1/2 wave antennas and UA802/UA825/UA850/UA8100 50 ohms low loss antenna cable. Shure recommends using UA820 1/2 wave antennas with UA221 splitter/combiners. UA820 provides up to 3dB of additional gain compared to standard 1/4 wave antennas. Additional gain compensates for signal loss in splitting applications.