I decided to upgrade the antennas on both my DJI Goggles 2 and the O3 air unit on my GEPRC Moz7. On the drone, I installed the longer Albatross V2 5.8GHz 150mm antennas, and on the goggles, I used the ORT Helical 3-Turn 5.8GHz antennas. I tested the setup along my "signal benchmark lines" in the forest. It's definitely an improvement!
Here is where I ordered these antennas:
Albatross V2 5.8GHz 150mm Antenna - 2x LHCP RP-SMA (HD)
https://iflight-rc.eu/en/products/albatross-v2-5-8ghz-100mm-antenna
ORT Helical 3 Turn 5.8GHz DJI Goggles 2 Antenna 2 Pack - LHCP - Black
https://www.racedayquads.com/products/ort-helical-3-turn-5-8ghz-dji-goggles-2-antenna-2-pack-lhcp-black