There are various references and opinions as to what constitutes the near field far field boundary. The common one from antenna theory is 2D^2/lambda where D is defined as the largest aperture of the antenna. Has anyone researched what the limitations of this formula are? I am interested in the far field boundary between 1-30MHz for large loops of wire. In terms of a loop if this formula is applicable is D the circumference or diameter of the loop. Thanks, Iain
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