CK and All: I had to find my reference book.
The book is Bill Orr's 1959 edition, All about Quad Antennas.
"At a spacing of approximately 1/8 wavelength, the parasitic element (reflector) provides an array gain of 5.7 decibels when adjusted for a maximum gain." " The gain curve is fairly constant for element spacing from 0.1 wl to 0.2 wl, with the peak of the curve falling near 0.12 wl spacing."
Calculation: 1005/27.200 = 34.95 ft.
34.95 ft. x 0.12wl spacing = 4.43 ft. ( 53.16 inches)
This would yield a radiation resistance of around 65 ohms, thus with spacing near 0.15wl radiation resistances nears 72 ohms.
The spacing curve for a 2 element array differs greatly, (it seems) from a multiple-element array (3 or more) where maximum gain vs, the pattern width is of greater consideration.
The best pattern width does occur at spacing greater than 0.25+wl on the array.
Looking at his figures best beam width plus best F/B ration occurs at roughly 0.50wl spacing.
Overall we are talking in micro-hairs with max gain of approximately 5.7dBd (at 0.12 spacing)
and decreasing to approximately 1 dB less nearing the 0.22 wl.
OK after all of that at 5-6:00 am in the morning and 3 cups of coffee.
I am toast, and ready for some radio fun on 6 meters scatter.
All the Best
Gary
