Heliax is the only way to go, especially if in the future, you need to run duplex communication. When I set mine up, I opted for 7/8" Andrew Heliax, with N- Connectors of course. I also dived in and acquired a DB420 antenna set up in an omnidirectional pattern. RG 400 makes perfect patch cabling...double shielded, yet flexible. My wife had a small coronary when she first saw it up, but she got over it in less than 24 hours. Antenna, feedline, and grounding are where all the money and effort should be directed. Do it once and do it right.