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It's claims like this that are an example of the problem.  A guy trying to peddle his nonsense by making BS claims is basically a thief.  A full sized 5/8 wave ground plane antenna should have gain of about 3db, which is roughly what the gain of 1/2 S unit.  So he's claiming that a very physically short, 1/4 wave antenna is going to have 3db gain over another physically short 1/4 wave antenna?  It's impossible.