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Here is a video entitled, "The effect of a 1:1 balun on a resonant dipole." Check-out this Common Mode Currents test idea on the feed line and elsewhere using some better testing tools. 


Long ago I tried checking this idea out several times...and I never was able to see an difference in the methods I tried...just using my radio, SWR meter. 


I did see a difference using an RF Field Strength Meter, but those results seemed to vary from time to time, and I could never figure that out. 


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