Its 6 core so you need 6 core cable, or just use network cable, with a 6P6C crimp on connector on one end and a RJ45 on the other.
I've made and used plenty done with normal Cat 6 network cable and they've worked just fine for lengths up to 20ft on HF and VHF/UHF. Just install the antenna properly.
I think you're talking about the mic cable rather than the cable between the radio and the control head. The control head cable has only four wires (yellow, green, black, red), but the mic cable has at least six wires.