Well yes, proximity is key here in my experience. Moving something a foot further away can
make a lot if difference.
Single coil guitar pickups are affected, monitors
are, if you put them close enough. This is an issue in the local church near me , the
induction loop was recently upgraded and rerouted. And the result has been distorted
signals in personal monitors and all sorts of stuff.
Did look at routing the
cable around part of the building, but that's against regulations. You apparently can't
put up a sign that says 'Hearing loop over there' as people might be embarassed by having
to sit in the deaf section.
I'm shortly going to attempt doing the obvious and screening a section of the wire and
see if that imprives the situation. Can't screen the whole wire, bviously, but it might be
enough to relieve the issue.
I've never liked a solo violin, you need at least five for a proper fire.