The quality of your communications will never be better than the quality of your coax.  FireStik's dual lead, co-phase harness assemblies are made from their RG-59A/U, Fire-Flex coaxial cable.  They may be used on any dual antenna installation.  Check out these features:

• Stranded center conductor to maximize flexibility and prevent untimely breakage. 
• Shielding coverage that averages 95% to protect against RF leaks and interference. 
• Polyvinyl center insulation for ruggedness and longevity. 
• Performance that exceeds mil-spec requirements for 75 ohm RG-59A/U coax. 

    The K-9 co-phase harness utilizes two 18' (5.5m) leads.  One end is terminated with a PL-259 type connector to match the connector on your radio and the other two ends are terminated with ring terminals on the center conductors and spade connectors on the shields.  This cable should be used in conjunction with K-4 or R-4 stud mounts and any mounts that use either of the lug-style stud mounts.