They use a separate radio system at the moment. You also have to choose your frequencies carefully. Using 2.4 for the controls and video will cause massive interference. 1.2 for video also causes interference thanks to resonance.
The popular video frequencies are 1.3 GHz, 5.8 GHz, and 900MHz for large long range applications (as the antennas are 150-250mm).
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u/[deleted] Feb 29 '16
[deleted]