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In addition to providing a good match to the antenna, the Model 404-UL's Matching Unit has been optimized to match the antenna's specific common-mode-current characteristics, assuring problem-free installations, even in less than optimum locations.
HOW DID WE DO THIS ?
We began with extensive field measurements on several OCFD antennas, charting their common-mode-current problems, by band.
Using knowledge gleaned from K9YC's excellent paper on RF chokes, entitled "RFI-Ham", plus the charts on G3TXQ's web site, we optimized the Matching Unit's choking impedance to match the Model 404-UL's specific common-mode-current trouble area.