12-channel 1GHz broadband passive headend combiner. -30dB high port-to-port isolation provides spurious carrier rejection and minimizes undesired channel interaction, thereby reducing picture distortion. Passive design allows full bi-directional flexibility for two-way digital and analog requirements. Directional coupler design and low insertion loss provide improved carrier to noise, system performance and picture quality. -20dB test port provides convenient access for headend testing and system monitoring.