While we're talking VLF - you can see a nice article on the 2MW Navy VLF station NAA at Cutler Maine in the September 1960 Popular Science . http://books.google.com/books?id=3yUDAAAAMBAJ&pg=PA60 and a nice article on VLF transmitter antennas at http://coldwar-c4i.net/VLF/design.html cheers, Nick K4NYW www.navy-radio.com