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You might want to check out this thread about a guy built his own Isotron antenna. Although it was tricky to tune, he was pleased with the results. There are pictures of the finished antenna and he explains how he built it.
As you know, there aren’t many MW antenna designs that eliminate the need for ground radials. The EH antenna is the only other one that comes to mind and, so far, the published results have been inconclusive.
http://www.pcs-electronics.com/phpBB2/viewtopic.php?t=1092
DB52
