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If you connect directly to a coaxial cable, you introduce an imbalanced condition that would likely skew the radiation pattern due to the coax shield being coupled to the antenna element.
The typical folded dipole will have a higher impedance than a simple dipole. How are you matching the antenna to the feed-line? A 300Ω/75Ω balun/matching transformer would be an appropriate choice.
Also, indoors is rarely an ideal 'test range'. HVAC ducts in the wall and any number of other reflective items can alter the antenna pattern and tuning.
Have you modeled the antenna in 4NEC2 or another antenna simulation program?
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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