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We're not talking about full length antennas.  We are talking about a 7/8 wave vs. a 5/8 wave.  The additional 1/4 wave length of the vector's vertical radiator gives it an RX advantage (more capture area) but it's TX radiation angle and lobe pattern isn't as good as the 5/8 wave.  The direct trombone style match is more efficient than the capacitive gamma style match.