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So using these figure in real terms:

Halfwave dipole with 100 watts to the antenna the,

 Effective Radiated Power = 100.4 watts

The A99 with 100 watts to the antenna, the ERP = 93.4 watts


So using these numbers as totally correct, the A99  has a 7% LOSS over a dipole under equal conditions....???

Having compared side by side with the good OLD Ringo antenna, I tend to believe they are  reasonably correct IMHO