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Zanshin, I'm not aware of any numbers for longwire antennas, but in general IIRC as the antenna "tubing" gets thicker, the antenna can work a wider frequency range with lower SWR.
I'm probably getting something not-quite-right with that description, but for conventional antennas thicker tubing has definite advantages, and the same physics behind it would tend to indicate a thicker wire for wire antennas might also have some real benefit. (Aside from being thick enough to carry power without heat damage.)
Something you might want to check into.