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I took another look at that 'second' antenna.  What it amounts to is a loaded antenna with a 'stinger' 5/8 wave length long.  No idea what what the equivalent antenna 'length' would be, but if you end up with a 50 ohm input, it's definitely not a 5/8 wave anymore.  that might explain the difference you're seeing between the 5/8 and it.  You think?

 - 'Doc