Our team is getting together a GPS mast kit we can send out for testing on Starling 2 Max. I believe your name is already on the list to receive it.
Regarding your question, the item you circled in blue is a 6-pin connector board that allowed me to extend the short cable using another 6-pin cable. It is kind of bulky, so i just taped over it.
In your implementation, does that look like you have two antennas stacked on top of each other? Can you please elaborate?
Also, did you get a chance to try out the GPS signal viewer in the voxl-portal? how high were your SNR during your test in open sky?
Additionally, as i mentioned before, the proximity of RC transmitter (within < 2 meters) of the drone seems to decrease SNR, so please check that. It seems the RC transmitter is sending out signal outside of 900mhz band, which affects GPS.
Regarding the upgrade mast kit, i am also going to receive it and test it to confirm that it performs similarly to my initial mast.
I am going to perform some more testing in the next few days. I know there are a lot of factors that can affect the GPS signal, i will try to summarize them all in a shorter write-up.
Alex