David,

The Par Electronics End-Fed Shortwave Listener's EF-SWL Antenna
uses 45 Feet of # 14 AWG Polyethylene Black Jacketed Flex-Weave
Antenna Wire with 168 Copper Strands as it's Wire Antenna Element.
FLEX-WEAVE = http://www.davisrf.com/ham1/flexweve.htm

That was the basis of the above # 14 AWG comparison ~ RHF