ref :electech2u
regarding "reflector" on the top of a search coil , if it's a metal it would be "seen" by the coil,
graphite spray or thin foil or scotch braid can be used as a faraday shield to keep out unwanted rf , but these only keep out rf , blocking "dc" low frequency / static magnetic fields as yet as far as i'm aware cant be done.
a magnetic field can pass through any material , may be weakened or distorted , but will go through , magnetic shield not yet invented , same goes for reflectors. (with the exeption of emp weapons)
best we have so far is the ability to block rf magnetic fields and aim / direct rf fields.
there is a material , cant remember its name , that can drasticaly reduce interferance from magnetic fields on electronic equiptment , don't think it would be usefull to us on a search coil coil as a magnetic field has to have a return path , if we managed to block that pass , it would find another path and just be distorted.
i stand to be corrected by my post above.
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