My guess
The left sort of looks like the outside of the cable so I think that's ground.
this post was submitted on 27 Dec 2024
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in your antenna, the outside of the coax makes up part of the radiating structure. The orientation of the elements in relationship to that coax will definitely change the radiation pattern, maybe for the better maybe for the worse.
putting ferrites around the coax right below the antenna feed point will make the antenna more symmetrical as it blocks RF currents traveling back down the outside of the shield.
It has a choke on it, it's a little blurry but you can see it. Should it be moved closer? I saw a comment on rtl-sdr's blog suggesting it.