Boy I know what you mean by the OM stuff. Going to attend my first Winter Field Day with them. Good thing I have other plans and people for the time and place.
Find a cable/frequency attenuation chart and choose the right feedline for your distance and environment. HF is relatively forgiving, UHF is revealing on cable attenuation.
I normally use Times Microwave LMR-400 (stationary/permanent) or LMR-400 UltraFlex (portable) cable for every serious operation run outdoor, above ground. Interesting to see hams spend a chunk of change on gear but skimp on $100 more for the right feedline for the job. Remember that attenuation works both ways - lossy on both transmit and received signals.
BuryFlex is also an option, better for harsh use or wet locations.
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