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Horizontal ground gain was known by hams in 1939 when they printed the first edition of the ARRL Antenna Book (only cost 50 cents back then, lucky them), and honestly, it was old news for ham's even at that point...  Unfortunately I don't have any CB books that talk about this effect.  That being said, the books I do have that talk about CB were geared for absolute beginners and would not have covered such a topic.


Early 90's there were CB operators around that knew of the ground effects of horizontal antennas, at least here in St. Louis.  That is about when I got started.  Was it general knowledge that every CB operator knew? No as most used CB only in the mobile, but it was known if you hung around in the right circles, generally the ones that included older operators, and that was 25 years ago.  It just so happens that many of those right circles are easier to access via tools such as forums today...



The DB