Bad HDOP with active GPS antenna

I ordered end of last week the active GPS antenna and connected it to my sodaq one v2. I do get GPS readings but a very bad HDOP, mostly in the range of 6-10, any idea of what is causing that and how to improve it?

Reattached all wires and it seems to be better now.

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Found that the code that I used had GPS.scan(false) which means the GPS gets each time a power off/on cycle, with the active GPS antenna this seems to result in a huge HDOP. Keeping it on gives a HDOP of around 1 after a few scan rounds.