steveeh131047 wrote:
I see 1A at
the base of the coil increasing to 1.07A at the centre of the coil and
then dropping to 0.69A at the top of the coil.

FYI Steve, five years ago I showed Roy how to estimate
the phase shift through the coil using ARCSIN(0.69) =
~46 degrees. To this day, he refuses to acknowledge
what EZNEC is telling him about current on a standing
wave antenna which is: A current phase measurement
on a standing wave antenna is meaningless. Here's a
couple of graphic that illustrate what I am saying:

http://www.w5dxp.com/coil.gif

http://www.w5dxp.com/phasor.gif

These graphs are very close to your measurements
above.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com