From working with the gamma match in real life--I have noticed it favors
launching the signal from the side of the DE which has the gamma.

Now in playing with the gamma formulas, I wondered...
What if the gamma rod is replaced with a "gamma tube", same set up as
the normal gamma, except the the rod is now a tube surrounding the
element which is being fed? Something of a "concentric match", I am
guessing the formula to compute concentric line Zo would come into play
here, or a near equiv... purpose would be to get rid of the favored
increase in signal from the side containing the gamma...

I know someone is going to suggest EZNEC--however, I am not good at
drawing a tube with it!!!!

Warmest regards,
John
--
Watching the cutting edge of yesterday replay--in virtual reality, right
before my eyes--in real time!
Thirty year old technology--wasn't it amazing?