Well, civilian GPS is 1.57542GHz . That is considerably below the ISM Band in 2.4GHz where your radio is. It's not on a harmonic either. Maybe the antenna on your NIC is defective (ie it's a little too short or too long) or maybe you have a less sensitive receiver. In any case, antenna isolation seems to fix you, so is there some reason you have to have the antennas pointed right against each other? Can you not get some sort of external antenna for one or the other to mount them apart?
If you still want to do this, you can put shome lead foil shielding in between the two antennas for isolation if they are inside something. Also, make sure your GPS antenna is not on its side. Polarity can make a big difference with GPS.



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