Total posts : 45366
Ermi Roos wrote “Electrically short monopoles have a near field that extends to about .1 lambda, regardless of the height of the monopole. [2*(L^2)]/(lambda) does not apply to antennas much shorter than a wavelength.”
Your statement above prompted a trip to my copy of ANTENNA THEORY, ANALYSIS AND DESIGN by C. Balanis (2nd edition) to refresh my memory. On page 32 Balanis states this about the reactive, near-field region, “For a very short dipole, or equivalent radiator, the outer boundary is taken to exist at a distance of lambda/2*pi from the antenna surface.”
That boundary distance is about 96.7 feet for a very short, linear radiator on 1620 kHz. Beyond that boundary the radiating far field voltage dominates, as the reactive near-field values decline by the inverse square and cube of their distance in wavelengths from the radiator.
So in the case of very short radiators your statement was more correct than mine. Thanks for pointing this out.