"I consider 2 wire lines as coaxial, but they too have design requirements in order to work like a feed line. Again, my point is a distinction I try to make. When we start to change the structural design requirements of coax or twin lead wires, the line is no longer coaxial...it becomes a radiator of sort"
i dont consider a two wire line as coaxial eddie,
you don't need to change anything physical about a two wire line to cause some radiation,
terminating it with an unbalanced load or feeding it asymetrically or placing conductive objects in close proximity to the line causes common mode to rear its head,
read the link i posted again, you don't need to understand the math to get the gist of what clayton is telling us,
"On the other hand we know the Gain Master works using coax to create constructive CMC's on its shield. IMO, Sirio uses the short sub to create as much current imbalance at the center point of the antenna, where the shield stops. IMO this is done in order to create as much CMC's to flow on the shield as possible and radiate constructively with the top section of this 5/8 wave wire."
imho the stub in the gainmaster is there only to create an impedance match,
kirchhoff takes care of the cmc's since any current entering the upper section of the antenna must be returned on the outside braid,
i won't speculate on what cebik meant in his comments about eznec as im not 100% sure he did not mean just very difficult for a novice,
"I looked this over and it has a lot of empty pages at first. So we have to go down a bit, and there we see more Greek I don't understand. I did read some of the text however. If you find in this a solution to this seeming epic task, you will have to put it into simple words...for me to understand"
anything from respected sources is complicated eddie, its a long time since i was at colledge doing equations,
if you want to analyse all currents including radiation from common mode you use MOM as henry told us,
"Nec4 may help to fix the problem, but I don't really know. This is just a guess, but maybe what Barkley says on the subject is why Homer and Booty had problems due to the lack of a hub too. I think the both had their radials way too close to the radiator."
from what i have read nec4 handles taper and dissimilar diameter elements and close spaced wires,
i don't know about flared radials,
the radials on the vector are closer at the base than i remember in booty's antenna,
"I might agree, but I have mixed opinions on whether the S4/NV4K does or does not have a ground plane"
kirchhoff tells us if current flows into an antenna it must have a return path,
the elevated vector definately does not have a groundplane in the same manner as barkleys open sleeve paper or the cage monopoles in the links, check them out,
"The only advantage I see with a dipole inside of an open sleeve is to add strength to the antenna. The Eznec model that Roy added to his software package, as an example, shows very little performance difference in any way for the model"
im sure the sleeve is nothing to do with adding strength to the dipole eddie, stronger tubes would do that and look easier on the eye,
there are open sleeve articles on the www and arrl books,
