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Got a feeling that gray PVC -may- have something to do with it.  But did you use the same stuff on the short post?

Another thought is that you standing next to it, and running your hand close to that groundplane, you might be introducing a little more capacitive reactance into things.  If so, and that's a bit 'if', a little less coil may be the answer.

 - 'Doc



(Thats one reason I really like using one'a them analyzers, it gives a better idea of what's going on without quite as many 'if's.)