I suggest that you would take the time to learn what causes common
mode current to be present on coax transmission line - regardless of
what kind of an antenna it is employed. (For openers I suggest you
start here http://www.w2du.com/r2ch21.pdf )

Then, after getting a grasp on that aspect continue to learn how
common mode current on the transmission line can effect the overall
performance of an antenna's radiation pattern - especially with VHF &
UHF antenna systems then you just might understand what people here
are trying to tell you.

Still others can't seem to understand that effects too small
to measure usually do not matter in the real world.

Others have measured this and reported it to you, but for some reason
you chosen to discount anyone who can show that it disagrees with your
"pet" theory. For me, I've place your theory along with the world is
flat, the moon is made of green cheese, and Iraq has weapons of mass
destruction .

But even for a skeptic, I would thing that the thought of coiling up a
few turns of coax costs very little, definitely won't hurt, and can
only help. Would be sufficient.

Danny, K6MHE

I said I was done with this subject, But ........ I can't take it
anymore.
Again, the Arrow Antenna OSJ Antenna does NOT need a choke balun.
By that I mean it will make no noticeable difference in performance of
this particular antenna.
(I am not lumping all VHF & UHF antennas together. I am ONLY talking
about the OSJ).
If you don't have a physical Arrow Antenna OSJ to test with and without
a balun, you don't know what you are talking about.
That goes for computer modeling also. You can't hook up a radio to
computer model.
This antenna works just fine the way it is.

By the way Danny, what is the name of your Antenna Company ?

73 Al Lowe N0IMW Arrow Antenna