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Uploaded on Feb 26, 2010
Homebrew Loop antenna for ham radio frequencies above 3.5 MHz (or 1.8MHz when modification is used). Construction details for low visibility (stealth) installation including coax feed line; photos shows what happens to the long spans of light wire subjected to heavy icing loads. Antenna functioned during and after the ice storm and returned to original position.
This antenna was made in October of 2009 by extending an existing 135 ft long 80 meter dipole. I used the loop briefly last fall in the 285 ft closed loop configuration with excellent results. For most of the winter, I have kept the 25 ft isolation section open so the antenna functions as a half-wave dipole on 160m. In this 260 foot configuration, the ATU will still tune the antenna on 3.5MHz and higher frequencies also (for example it works as a 2-wavelength loop on 7 mHz) but most of the comparison tests I have made on 80 and 40meters show that the 285 ft closed loop is much better than the 260 ft doublet above 3.5MHz.
I have had the antenna back in the close loop configuration since February 20th, 2010. It was stuck to the roof for about ten days after the ice storm ;-)