Hello I modeled this antenna using EZNEC and it works much better on 40-meters compared to 80-meters with the top section 60-feet high. The radiation patternMessage 1 of 3 , Aug 28, 2012View SourceHelloI modeled this antenna using EZNEC and it works much better on 40-meters compared to 80-meters with the top section 60-feet high. The radiation pattern displayed for 40M was quite flat-topped (not much vertically being radiated but no null at 90-degrees) while on 80M it was radiating most of the power straight-up showing something like 6dB gain at 90-degrees.I should have moved the wires up to maybe 80-feet and observed the gains on both bands but, then, most folks will have a hard time getting the top wires up to 60 feet so I didn't bother to make that evaluation.73 - Dick/w7wkr/CN98piOn Sun, Aug 26, 2012 at 10:20 AM, Frederick Benson <flbenson@...> wrote:
Does anyone have a functional EZNEC+ model of an 80 meter superloop antenna? See the diagram at the link below.
This antenna works as a Full Wave Loop on 80 Meters and also works as a 2 wavelength open loop or Bi-Square on the 40 Meter band. The 450 ohm ladder line stub acts as a switch on 40 meters to create the Bi-Square configuration.
If anyone has an EZNEC+ model of the antenna to share, please send me a copy as an Email attachment to nc4fb@....
--Dick Bingham - W7WKRStehekin, WA CN98piOREast Wenatchee, WA CN97uj