[ADTech]

I doubt that any of the five antennas you proposed would outdo the DB8 on UHF. Of them, the HBU55 would be a suitable candidate as would the step-up from the 7697 (the 7698) if you were to go with a single antenna attempt. Keep in mind that those antennas are about 12-14' in length!

In our lineup, only the 91XG is "stronger" than the DB8 on UHF, and that's on the higher end of the UHF band. On the lower end where most of your UHF stations are at, the C4 is actually a bit stronger. I'm not particularly optimistic about any of them being very successful for you location.

The PA18 is a very decent fringe/deep fringe pre-amp. I've tested its noise figure in-house using an HP8970A to be between 1.8 and 2.2 or 2.3 dB, depending on the frequency. For its price point, it is a very good pre-amp for your location.

I did not mean to imply that YOUR reception would be best at ground level, I was illustrating the limitations and vagueness of the TVFool modelling engine when faced with very severe terrain conditions. Please take a moment to carefully review my earlier remarks.

You're in what I would politely call an "extremely challenging" location for reception. As the two previous posters have remarked, you're in for a lot of experimentation and, IMHO, a lot of frustration.