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Another problem i see with the cst images of the vector 4000 and gainmaster is no-one here really understands how cst works,myself included, so they are trying to translate those images of two of the most complex cb verticals ever made with absolutely no grounding on this software from basic antennas. 


What would help immensely is plots of a basic 1/4 wave gp like a starduster m400 and a couple of half waves,one centre fed and one end fed for comparison purposes  along with a basic 5/8 wave with and without radials .you have to learn to walk before you start trying to run. 


just my tuppence worth,


it would be nice if sirio could post these plots of all the different antennas on their website side by side for easy comparison, would probably end one hell of a lot of arguments on cb verticals.