Just lookin' at it, and brainstormin', it appears to have 2 H (M) Field ferrite loops: one Horizontal plane loop, and one vertical plane... (We assume signal polarity as the plane of the impulse E field component). The physical "horizontal' ferrite would be for H (M) field detection of 'Vertically polarized impulses' , and would be 'bi-directional' at right angles to its axis, e.g. "N/S", but weak or null on "E/W" (along the axis) ... the 'Physical Vertical' antenna would be after the H (M) Components of any 'horizontally' polarized sferics... would be Omni directional, and may also contribute somewhat to "E" components of an impulse....