Download video: Cheerson CX-20 unboxing with 2 antennas
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CX 20 unboxing my first drone.The 2 antennas are on the bottom. My understanding is they trying to find the strongest signal.Whichever one has the strongest signal is the one that fly the quadcopter .This is so you don't lose connection between the quadcopter & your controller.This is so you have more control over your quadcopter with no interruptions. The signals are jumping back & forth keeping the strongest signal. Maybe this will help to understand why there are 2 antennas. You can get one at www.toyrackdirect.com good people & fast shipping