I have a quick question regarding a Wi-Fi antenna modification I am doing to my drone controller. I want to replace the antenna which is soldered to the board in the controller. I want to replace it with a SMA connector, so that I may mount an external antenna instead.
My question is: how do I ground the outer wire on the circuit board? Is it okay to run a wire carrying the outer wire current to GND? Or do I have to use the antenne ground? Where would I find that? 
Answer
There's no proper wiring of the return path on that board. If you connected the shield of your external antenna "somewhere" to GND, you won't get an external antenna but just a long internal+external antenna wire.
Find the WiFi PHY chip (could be that one near to the existing antenna) and check which pin is HF ground. Your cable shield goes there.
EDIT: Oh yes, and Marcus is right, wire antennas are often enough not 50Ω impedance so you may need an impedance matching transformer.
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