snip
The X-terminator has its main lobe at bit higher angle than the whip
does. That may account for some of the differences.

Chrome has about the same conductivity that Stainless does, or at
least from the info I found. 3-15% for Stainless, 19% for chrome,
relative to copper.

I'll have to go through the archives to find the numbers but chrome is
a better conductor than Stainless