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I'd finish proving that there are no problems with the matching transformer and coax that attaches directly to it... Once you are certain you are looking at the true performance of your existing antenna, you can make an informed decision regarding the purchase of a new antenna.
If the HBU-33 is not capable of receiving a reliable signal at it's present position, I'd also exhaust all reasonable options for alternate mounting location and height. Sometimes, a move of just a few inches can produce a significant change in reception.
If the HBU-33 is functioning at or near 'new / out of the box' levels, and can't deliver a reliable signal, the added 2.5 dB UHF gain of the MXU-47 would be less than I would want... I would opt for an Antennas Direct DB8E which will give you the highest UHF gain available in an off the shelf UHF only antenna.
I would also expect little difference in H-VHF performance when comparing the HBU-33 and Y5713. The HBU-33 'should' be doing very well with the relatively strong signals on real CH-8 & 10... Which is why I continue to suspect a problem (or multiple problems) with the existing antenna, matching transformer and/or coax.
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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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