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Gee, think I would just rebuild it to the same standards that it was built in the first place.  The element spacing are the same as a 6 element Yagi would be.  The loops diameters of your Quad should be all standard for any 6 element Quad would be too.  Perhaps Henry can say if it can be improved upon, since the day that antenna was first designed wasn't with the benefit of computer modeling.  Might be some improvement in the element spacing and boom length.  Henry should know.