After playing around with the idea of buying a modified antenna, then researching the antennas available for the Mavic Air, deciding on Titan Control 2.4 against 4hawks SR, having an awful experience with the Titan Control, not being able to return the panel ($129 + shipping wasted), using the Titan "Whip Dual Band Antennas," ($39 + shipping), testing them and finding out they ALSO suck, I went back to Stock and usually get 2,200 meters (with $8 parabolic extenders, on 5.8) before video breakup. I have no idea why DJI's antennas outperform all the other things I've tried, but I have to say they are definitely better than regular antennas, especially for their size.
So after dumping $178 in the bin on the Titan System, I am back to stock and thinking of buying a 4hawks (but I am scared I will be left with another worthless product in my hands if it does not work well for me). Titan support did offer to make a discount on their boosted panel, but I am not confident in the quality of their products after my experience with their entry level system (Control 2.4). I actually got 30-50% WORSE results than stock on all my tests with the Titan Control 2.4.
Stock 5.8 with parabolic extenders = 2,280 meters (6,800 feet) in Capital City with high rise buildings and extreme interference on 2.4 (thankfully 5.8 routers have not become mainstream down here atm). My goal is 4km, but I am nowhere near it yet.
E.