The HEBA appears to be the same animal as the CFA (Crossed Field Antenna) patented by Dr. Kabbary and M.C. Hately in the late 1980s. As the HEBA Model 103 Performance Analysis says, *" WWAS accomplished this feat of engineering through the development of a two-element antenna that generates the electric field and the magnetic field separately."* This is the idea of the CFA where separately generated E and H fields combine in space to overcome one or more limitations of conventional antennas.
I thought the CFA was debunked by the time the last one was sold by Dr. Kabbary's Egyptian antenna company in 2003. Up to that time there were several articles in AntenneX magazine about the antenna along with attempts to build and test it. Dr. Kirk McDonald, a regular author for AntenneX, goes into the math in his paper *“Crossed-Field” and “EH” Antennas Including Radiation from the Feed Lines and Reflection from the Earth’s Surface.* My NEC models at the time for a CFA driven as a standard monopole against the Kabbary-recommended 2-story, copper strapped building showed it operating well enough as a standard monopole. The CFA on top of the two-story building formed a center-loaded monopole. I can build that model again and report back here if anyone is interested. I will compare them to the HEBA performance analysis. Sometime around 2002 an Australian ham/BC engineer worked with Dr. Kabbary to tune up a CFA at an AM broadcast station in Australia. After Kabbary give up and returned to Egypt the amateur retuned the antenna as a standard monopole that exceeded the measured field strength of the CFA tuning. To me and others the promise of the CFA for topband was a heady time which helped propel me more deeply into antenna design and analysis. The CFA turned out to be both a disappointment and a good lesson. *Wikipedia CFA article* https://en.wikipedia.org/wiki/Crossed_field_antenna * “Crossed-Field” and “EH” Antennas Including Radiation from the Feed Lines and Reflection from the Earth’s Surface*, Kirk McDonald, Princeton University http://kirkmcd.princeton.edu/examples/crossedfield.pdf *HEBA Model 103 Performance Analysis* https://www.thebdr.net/wp-content/uploads/2020/06/high-efficiency-broadband-plain-english.pdf Dave KH6AQ On Fri, Apr 19, 2024 at 6:01 AM Radio KH6O <[email protected]> wrote: > I'd like to see a version of this for 160M: > > > https://www.radioworld.com/news-and-business/headlines/wqvram-is-granted-cp-to-use-heba-antenna-at-night > > -- > 73, > Jeff KH6O / 6 > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
