Ok so I'm getting back active with my ham gear and while looking into a new
HF antenna, discovered a new cable type being recommended here and there,
RG-213. What is so much better about RG-213 than what I have used so much
of over the years, RG-8?

RG-213 has less loss per 100 ft than RG-8. Nothing too significant though, not
at HF freq's at least. Check out:

http://www.radio-ware.com/products/t...o/coaxloss.htm
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73! de Andy KC2SSB - WPYI880 (GMRS)
Beachwood, NJ USA! Grid FM29vw
http://vhfradiobuff.tripod.com