Looking at the 4-square array, often used by Ham Radio operators seeking both gain and front-to-back on the lower bands. When you have amazing front-to-back ratio, you will hear better regardless because 75% of your receive is now effectively obscured by the f/b ratio. Fascinating discussion. I have ordered one – and will be using 4 x DX Commander Sig 9 poles 🙂 Callum.