[ADTech]

After looking at the aerial photos of the coordinates you sent, I can only conclude that it will be impossible to make an accurate prediction of actual reception conditions at your location.

Trying the pre-amp is a prudent measure. It might help, it might make no difference. It won't harm anything, in any event, if it is properly installed and it is functional.

Using a compass to get oriented is highly recommended.

Experimenting with the height and specific location is recommended.

Expecting reliable reception, especially on UHF, is probably not a realistic expectation due to the forest, topography, and the weak signals in the vicinity. The two VHF channels, with a VHF antenna, are less likely to be impacted by the foliage.

Wish I had a more optimistic prognosis about your situation, but I've spent way too much time out in the woods with antennas since the digital transition and almost every time there are problems.