Unsatisfactory GPS reception on PinePhone?

[awaittrot]

Have you scratched stock antenna on the phone to get better electrical contact or used some electrically conductive glue? Could you get a better picture of your antenna?

I have done the same modification as Benatti described. Antennas on the phone have conductive surface, so you don't need to scratch. A little bit of pressure has to be applied to get better contacts between aluminum sheet and antenna.