On the one hand, I know from my childhood that you can improvise an FM antenna from a fork or indeed any piece of metal. On the other hand, read this:
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And then, all antennas in the v3 are covered by insulating tape, except the antenna used for making calls (is that called GSM antenna?) which is a piece of wire running along the right side of the back, all the way down to the bottom of the battery (for pictures, search this thread for "How to open the phone").
So I don't know whether the sticker works. I get a very fast lock when not moving, but when moving the GPS keeps tracking me but puts me NEXT to where I am (e.g. 20 meters east of the road) but CONSISTENTLY. So I'm starting to think this may indeed be a software issue after all.
I did all I could with Engineer Mode, GPS.conf file etc.
Without any extra antenna or aluminum foil, I can get 3 meter accuracy, and after a warm lock (taking about 10-15 seconds) the phone is connected to 5-10 out of 10-15 satellites. So it's receives signal really well.
Using navigation apps with the phone can be done, but it;s not very satisfying.
Mediatek chips seem to consistently have problems in that area, and I think many apps rely too much on a lock more precise than what the chip can achieve while the phone is moving (e.g. in a car).
The Qualcomm products are still much better in this respect.
Also, it seems like Waze and other apps rely very heavily on the GPS and almost not at all on integration of other sensors (compass, gyrospcope etc.), which is a shame, because the V3 has the same number of sensors as flagship phones from Samsung and LG.
It has linear acceleration sensor, rotation vector sensor, and g-sensor, which most Chinese smartphones lack.