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the swr on the feedline has nothing to do with the fact that @ 102" your antenna is operating in the 10 meter amateur band. you've allowed your education by antenna manufacturers to interfere with your learning.


feedline swr indicates whether or not the antenna is matched to the feedline. it never has been, isn't now and never will be an indication that the antenna is operating at any particular frequency.


246 ÷ (102") 8.5' = 28.941 mhz., 246 ÷ (108.588") 9.049' = 27.185 mhz..