These are anything but, magical! but one stumbled across on the bay of "E",
and susposed to be for 160-10, is offset fed by about 20 %! sounds more
like a windom, or zepp to me, and might be interesting to try-match
shouldn't be quite so wild. - his web page is:
http://www.hfantennas.com/index.htm


Might take a look-- Jim NN7K P.S. have no connection with the site owner!,
Jim