I'd like to build a K9AY array to cover all directions. I have three 20' poles at my disposal, essentially allowing the installation of two K9AY antennas at right angles to one another. All I've seen are the delta/triangular shapes and wonder if they can be rectangular. If so, what would the dimensions be? Other receiving antennas ideas that might be better? Any help is appreciated. 73, Ed NI6S