When looking for a range extender for your Anafi drone, look no further than FPVLR circular polarized antennas. They are the best performing antennas for all WIFI based drones, like 3dr Solo, Parrot Disco, Phantom 3 standard etc.
The noise cancellation properties of these antennas will give your CE drone over 3km range.
FCC version of Anafi will be able to travel even further.
These ranges are measured in the country, away from city wifi noise.
Amplifiers can be added to double what these antennas can do, and provide ample power for long range even in the cities.
Anafi CE version will go about 1200 meters in heavy wifi city areas, and 3000 meters if also amplifiers are used. If flying in the country with amplifiers, the max range will come around 6k, which is not achievable if you also need to fly back. 3.5km is about the best that can be done if you want to be able to fly back home.
Instructions to mount these antennas will follow shortly on major facebook groups and youtube and will be linked here.