I suspect you have a bad match at the folded dipole since you attached the co-ax directly to the element. A folded dipole has a characteristic impedance of around 300 ohms at resonance, so a balun would work well here. You could use one of those outdoor tv 300 ohm balanced to 75 ohm unbalanced to good effect here, and then use something like RG-6 down to your scanner.
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Jack
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