The PRO-MAR4-TNC from Amphenol Procom is a Multicoupler with Frequency 0.01 to 108 MHz, Gain 10 dB (Adjustable), Isolation 17 to 25 dB, Noise Figure (Amplifier) 4.5 to 5.5 dB, P1dB 6 dBm. Tags: Module with Connector. More details for PRO-MAR4-TNC can be seen below.