Digital cable and cable modem requires the ability to ?talk back? to the cable company?s system, standard cable TV amplifiers lack this ability. This amplifier is housed in a robust, tin plated zinc housing providing 130dB shielding against RF leakage. Low internal noise and built-in magnetism resistant ferrites ensure a clean and clear picture. The forward gain (54~1000MHz) is 15dB and the reverse gain (5~42MHz) is 0dB.