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Steve Eddy : <font color='#000000'>Theoretically an ideal coax has an effective loop area of zero and therefore would be immune to magnetic field coupling.
What you might ultimately prefer from a subjective point of view is something only you can answer however.
se</font>
<font color='#000000'>Using old style theory, yes indeedy...
I can envision a magnetic field that is capable if inducing a signal within a coax..so I would recommend a twisted pair myself.. And, no, it doesn't involve the 5 to 10 tesla fields we use here.
And, no, I haven't used twisted pair in any of my mobile audio field apps. Tain't never had a need to.
A little verbage: if the field that crosses the coax is relatively uniform from one side to the other, yes, the loop is zero. But, if there is a field gradient across the width of the coax, there will be a net difference between the shield and the center.
Cheers, John</font>