This design is copyrighted. Commercial use (as in reselling or manufacturing) of this design will be viewed in an unusually poor light and may result in litigation. That said, ANY person may feel free to construct and GIVE AWAY an antenna based upon this design or a copy off the design itself, unless it is being used to promote a commercial product or service. If for example a vendor wished to incorporate this antenna design as part of their documentation with appropriate attribution to the designer and this web site. I would not take issue. If on the other hand the vendor were to lay out the design on their packing material such that the end user could build one by cutting it from the box, I believe I would file suit as I (the designer) intend to build/lease the design commercially. Please respect the research and time I have invested in improving and simplifying this design. I will defend it. I am a reasonable man and I am easily contacted.