Mr. batenet
Sorry, S. Korea is also not responding. None of the e-mails came back with an answer, and both lines (US and S .Korea) are not responding. The date on the data sheet is 2005 (11 years ago). They might change the phone numbers or no more in business. It is a dead end.
Some links say that the DF is high but no figures are provided. I would assume it is 500 and go with a 0 AWG for 8 ft. long.

