Search on H-field antenna. Then click on "Standard H-field NRSC
antenna
-Chris Scott and Associates. The LP-S series stanard H-field Antenna
is
specifically designed for emission measurement of AM broadcast
stations
using a spectrum analyzer or other calibrated receiver.

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Is this just the usual pseudo-scientific language used by American
antenna salesmen and others?

It all helps to boost sales to the gullible public.