if i ever said line length won't effect cm impedance and current i must have had a brain fart, i don't remember claiming that, ever since i came across maxwell & ji i have know that it does,
i don't think height is the issue, the electrical length of the outside shield and it been grounded or not effects cm impedance/current magnitude as i have said several times in the past.
you can see and hear when rf is screwing with pc speakers lamps tv's etc, many people have had their mic bite them,
some people can feel the effect without any bite when their hand has a strange aching/heating sensation, 600w+ fm in a mobile will often do that if the coax or mic lead is not choked,
my own experience tells me choking the line can cure all the above but not always,
you can also measure the currents with a current probe like one of the freecells suggested some time back or by using the very simple meter that w8ji and other guys show us,
since nec and others use the known laws derived from actual measurements by folk like kirchhoff, id be very surprised if current measurements did not closely agree with antenna models.
