Please do not forget, that 2,4 GHz do not differ to match in wave length from 5 GHz.When you use the 5 GHz band, it does not matter what kind of antenna you use. The shorter waves used by the 5 GHz band make it less effective in penetrating walls and fixed objects. It also has a shorter effective range than the 2.4 GHz band.
One is 12 cm the other is about 6 cm. Neigther will plow throgh buildings or trees with stuffed crown.
Other fact, that controller and AC use lower signal energy level in FCC mode at 2.4 GHz as at 5 GHz. Difference is 3dBm.
This is an additional reason, why DJI say, that they product's range is higher on 5 GHz as on 2.4 GHz
So, I agree, antenna can not help to go through snow on trees, but its true for 2.4 GHz as well
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