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It will help you do the Fimi A3 experiment later.
I did antenna DIY. This is an antenna that we used in Hubsan H501ss and we took it and installed it in Xiaomi Fimi A3. H501ss one was able to travel about 4Km to 5Km with this antenna. Before that, the battery of Fimi A3 must be DIY and have sufficient capacity.
I'm planning to travel a long distance. Look forward to it. ^^
*** Please note, the 2.4G antenna needs a simple DIY before installation. When you buy it, you'll be embarrassed because it's in the opposite direction. When you disassemble, assemble and turn 90 degrees, you have to look at the drone on the front.