Roy Lewallen wrote:
I measured current (of which the definition is well understood except
apparently by Cecil), and took a lot of care to do it right. Cecil
doesn't like the result, so he's created an imaginary quantity he calls
"standing wave current" as an attempt to invalidate the results and
promote his imaginative theories. Since it's wholly his creation, its
properties are free to be modified as the immediate argument requires.

Roy is mistaken: Here is what Balanis says in "Antennas":
"The sinusoidal *current* distribution of long open-ended
linear antennas is a *standing wave* ... The *current* and
voltage distributions on open-ended wire antennas are
similar to the *standing wave* patterns on open-ended
transmission lines."

Most good fields and waves textbooks provide the equation for
standing wave current although the equation for standing-wave
voltage is more popular. I certainly did NOT invent the concept.
Why do you think a standing-wave antenna would not contain
standing-wave current?

Roy, here is a public EZNEC support request for you from
a loyal EZNEC customer.

There are 10 segments in a 1/4WL monopole over average ground.
Here is what EZNEC predicts for the currents in each segment.

EZNEC+ ver. 4.0
1/4WL vertical monopole 4/17/2009 6:46:08 PM
--------------- CURRENT DATA ---------------
Frequency = 7.29 MHz
Wire No. 1:
Segment Conn Magnitude (A.) Phase (Deg.)
1 Ground 1 0.00
2 .97651 -0.42
3 .93005 -0.83
4 .86159 -1.19
5 .77258 -1.50
6 .66485 -1.78
7 .54059 -2.04
8 .40213 -2.28
9 .25161 -2.50
10 Open .08883 -2.71

There's about 9 degrees per segment so the number of degrees
between segment 3 and segment 7 is about 36 degrees. If you
put your current probes on segment 3 and segment 7, you will
measure a 1.21 degree phase shift in those 36 degrees of
antenna (just as you did in 36 degrees of loading coil). How
do you explain how to accurately measure the number of degrees
in a wire given EZNEC's numbers? Why do you think a coil is
any different from a straight wire?

As I, Jim, other posters, and all good texts have explained, a standing
wave describes the amplitude envelope of a voltage or current, as a
function of position, which results from interference between traveling
waves.

The total current is sometimes parsed into a standing wave plus
a traveling wave. In a standing-wave antenna like a 1/2WL dipole,
the standing wave current is about 90% of the total current while
the traveling wave current is about 10% of the total current.

Total wave = forward traveling wave + reflected traveling wave.

Total wave = standing wave + traveling radiated wave

There's no such thing as "standing wave current". You'll find no
references to this fictitious entity in any electromagnetics text.

Absolutely false. In "Fields and Waves in Modern Radio".
by Ramo and Whinnery, 2nd edition, page 42, it gives the equations
for standing wave voltage and standing wave current. The current
equation is: I = (e^jwt/Z0)[Vfor*e^-jbz - Vref*e^+jbz]
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com