The C-0300 is a return path amplifier that provides 15dB of gain in the frequency range between 5-42 MHz. While many amplifiers are ?Bi-directional they typically allow signals to pass back to the cable company without amplifying them. In some cases this is not a problem, but in larger systems, the insertion loss of splitters may prevent signals which are transmitted by your interactive cable box from returning to the cable company. This problem may prevent your cable box from working properly. The C-0300 works to supplement an existing distribution system. It only amplifies signals in the return path and allows signals in the forward direction to pass through with minimal attenuation.