For those interested in the development of the Antop 400-BV, here is the backround to that antenna:
According to the manufacturer it is the equivalent of an 18 to 24 element yagi. This statement by a company that manufactures all sorts of yagis…
(I mentioned the specific technical design in another thread) -
Also a view of the Qiaohua Corporation:
They manufacture every type of antenna and are the suppliers for Solid Signal in the US. Very impressive operation with 1,500 employees.
Over US$2,000,000 is invested in RD activities every year: