I just saw an index on ARRL's site that indicates the QEX magazine index mentions the NVIS antenna two times; 1950 & 1955. Here is the web site for the index. I don't have access to QEX archives. http://www.arrl.org/files/file/QEX%2520Binaries/07_November/2007_Index.pdf Hope this is of some help. Best regards, Ralph Howes W8BVH