"J.B. Wood" wrote in
:

The E and H far-field formulas I previously provided give magnitude and
direction of these vectors using spherical coordinates (r, theta, phi)
relative to a Cartesian system. If you don't understand coordinate
systems and vectors then I can see why you might be confused.


I'll admit to that. All I knew was that this loop I saw was a helix,
pointed so the axis of the 'cylinder' would point to the stantion wanted, and
was laid with an open coil on a frame rather than wound like wire on a pully
or other former that would bunch the windings as close as possible. I
imagined that if ether form were pointed not-so-accurately at the right spot,
the helical form might 'blur' the response, weakening it, allowing it to be
more selective of something it WAS accurately pointed at. Other than this, I
don't know why it would be built with this extra spacing per turn, because it
limits easy portability. I assume there is a good reason, I just don't know
it..