I would/do use RG-58A/U.? It has a solid polyethylene dielectric rather than foam, the center conductor is stranded, and it is cheaper than a lot of other options.? LRM-240 is big, has a foam dielectric, and solid center conductor.? RG-8X has foam dielectric.? Though RG-58A/U can't bend as tightly as RG-8X, I believe it will withstand more abuse due to the solid dielectric.? I may very well be wrong on that.??
At 30ft on 20m you would have something like .66dB loss with RG-58A/U.??
Joshua
Joshua KJ7LVZ