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Elevating any antenna will usually help performance. However, there is nothing you can do with matching or feeding the end fed half wave that will increase it's gain beyond unity. The center fed dipole that requires no matching is the standard of reference. Increasing matching efficiency in the end fed half wave can only get it closer to unity gain, not more.





This is hardly a good argument to support your idea that an end fed 1/2 wave can have gain. The SGM is neither an end fed or a half wave.




The available information on the Avanti patent clearly claims 1 db over a 5/8 wave and 30 years later Sirio's specification of 2 db over a dipole is within two tenths of a db difference.





I'm really not sure what your motivation is but many of your ideas on this antenna are not accurate and do not help others to understand it's function.


While I don't usually mind sharing information about my products, I also have business interests to protect. Since I begin posting information about this design, my competition has both stolen the information I posted and attempted to clone my product. Sirio is having a similar problem with their models. At this point I will no longer be posting technical information of this nature online before it is branded with my company logo to prevent theft.


Another issue is that it has become clear you don't take my word on many of the things I've explained relating to this image. Please explain to me what you hope to gain from seeing the complete file? When you understand the image you will also understand you cannot learn a single thing more about how the antenna works seeing it at any other phase angle then 90 degrees. It just looks pretty.