4 Bay Current Flow Diagrams It isn't perfect but it isn't bad for a wide band antenna. DIY Antenna Home 4 Bay Kits Reflectors Reflector Mount Kits Complete Kit Field test data 4 Bay kit Instructions Pictures and Examples 2 Bay Kits Drawings Contact Us The above diagram is showing the current distribution  at near a half wave for a 9" bay spacing. As can be seen the current is very close to the same on the inner and outer elements but the outer elements are just slightly out of phase as can be seen by the little dip in current just after the whisker / phase line junction. The above diagram is showing the current distribution  at well above a half wave for a 9" bay spacing. here you can see the elements are all out of phase to a certain degree with the outer bays being a bit further out than the inners.  The above diagram is showing the current distribution  at well below a half wave for a 9" bay spacing. Here you can see the outer bays are more in phase than the center 2 and the current distribution is a bit unbalanced between bays. It's still not enough to cause signal cancellation between bays, but they are not all working perfectly together. The above diagram is showing the current distribution  at VHF-HI frequencies  for a 9" bay spacing. You can see here we are getting no where near a full current lobe on any element and the outer 2 seem to be carrying most of the load. Most of the current lobe is running up the phase line with the remainder coming out the whiskers mainly on the top and bottom bays. Luckily not much current is flowing in the center bays since these would be way out of phase with the outers causing some cancellation. I enhanced the current flow on these diagrams to better show the lobes so some examples may be showing slightly larger lobes than others. On UHF because of the distance difference between the inner and outer bays all 4 are never quite in phase at the same time but are very close  and there will be times when one is slightly out and the other is on and visa versa. There will also be times where they are all out of phase as compared to the wavelength but the inner and outers still remain quite close to each other.  On VHF-HI it's a much different story it appears the antenna behaves more like stacked inverted L antennas with the center 2 whiskers acting mostly as loading lines and not adding much to the radiation of the antenna.