When building my wings, we routed a copper wire in the bottom skin as an "S" pattern. (Over 30ft) each wing. At the time, the one person recommended doing this as I want to fly over Carribean waters in the future and said I need HF. I have the two wires coming into my tunnel now and I'm going to run them forwards to my avionic shelf. I don't have a HF com yet and won't for a few years, just trying to plan ahead. My tunnel is only 6 inches wide, how close can the wires be to each other? Can I shield them from each other, can they cross each other if they are shielded? I don't know anything about HF or antennas. Thanks for your help.