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Eddie,

i don't know the exact measurements of the mast above the isolator, it was thrown up in a hurry & not as i would usually install an antenna,

its two pieces, 12ft of 1-1/2" tube slotted inside about 7ft of just under 2" tube about 17ft in total,


no idea where resonance is either, only that minimum vswr is lower in frequency than i want,  27.500 would be ideal.