The strip-line type balun used on many of the AD UHF antennas will tend to be close to a short circuit in the L-VHF band. I wouldn't expect much VHF signal will pass the stock balun on the DB(n)E antennas or the 91XG.
You may have better success if you use a UHF/VHF signal combiner to insert the VHF dipole into the down-lead. That would also require a separate balun for the VHF dipole.
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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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