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gamegetter, I agree. I also consider the patterns pretty similar, but Sirio notes in their manual that the New Top One is a 1/4 wave antenna.

 

However, I haven't seen anywhere that Sirio called the astroplane a 5/8 wave. Some years ago I argued the same point, that the AstroPlane was effectively a 5/8 wave radiator.

 

Homer, like gamegetter suggested above, the little difference you see in my results might be due to the height differences.