Discrepancy between EMF measures
The Earth's magnetic field is about  30uG at the equator and 60 uG  at the poles.
A small solar flare can cause 200uG. 

For RF measurements you must also consider the power and  Bandwidth of your magnetic fields to make reasoned comparisons.

1 T = 10,000 G

So 1 mG= 0.1 uT