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I can't vouch for the accuracy of your models Eddie but i have seen enough j-pole models from respected sources to know they don't have 2.14dbi when mounted over real earth,


Henry has a good article on his website with full instructions on how to build a j-pole,

His models and real life measurements using a vector 4000 indicate the vector and j-pole produce similar results,


Give or take a few dbi depending on height above real avg ground id say you are not far from the truth.