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Perhaps I was being pessimistic with the 5/8 wave Marconi. Because it is 1/8 wavelength over a 1/2 wave, there is a chance you will see some slight improvement slanting the radials a bit upward. Since the vertical portion on a 5/8 wave is only long enough to take advantage of a 1/8 wave delay at its base, the gain here will be much less then slanting the radials up on a 3/4 or 7/8 wave. This will also shift the drive impedance and require changes in matching that 5/8 wave.