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Marconi,

Here is where I got those dimensions, more or less:

 

http://www.worldwidedx.com/cb-antennas/31799-avanti-sigma4-alternative-view-point-14.html#post226120

 

Also, today as I was working a little DX on the Q2v4k, I had someone call for me. As it turned out this fellow was ENE of me about 40 miles. I switched off to the dipole and he dropped down right into my noise floor, I switched back to the Q2v4k and he was back into my receive with no trouble.

I did not get so many bars on him either way, but the audible difference was significant.

In every case so far I have noticed a perceivable difference in the increased receive on the Vector.

 

You'll notice the radials length is 106.5"

and the Gamma Match is 17-13/8" lengthx 1/2" diameter and the rod is 33-7/8" length x 1/4" diameter