SureCall couplers are available in -6 dB, -10 dB, -15 dB, and -20 dB options and are compatible with all 2G, 3G, 4G and 5G signal booster deployments in the 600MHz to 2700MHz range under all North American carriers. A coupler, also known as a tap, is designed for maintaining signal strength across a series of indoor antennas stretching some distance in a cell phone signal booster deployment. This component unevenly distributes the signal coming into and out of the coupler, ensuring less signal loss out of one port which enables the next broadcast antenna down the line to receive an adequate signal despite the signal loss from cables and multiple antennas.