electrical wires / stainless steel shielding / longitudinal fields

hello everyone,

while working on an old house in the countryside in france, i got a bunch of questions.

there is a electricity-pole rather nearby with a single wire ( 6 mm wide )  going down into the ground ( 0 ohm ), and current on it ( measured are 50 Hz, 4 volt/meter and 30 nano-tesla , see one picture ).
does that mean that the whole area could be contaminated and these fields enter the house along the earth-wire ?

it seems a good idea to replace the inside wires with shielded ones.
i still have quite some cable with a steel shield ( groundcable ), which blocks the electrical fields when earthed according to simple meters.
the question arises however what will be best to use considering longitudinal waves ?
perhaps it would be even sufficient to only use some aluminium-tape, at the beginning of each cable.

around the bed-area i intend to place stainless-steel /glassfiber a2000+ shielding.
since also stainless steel products are sold at the hyperschall-shop to reduce exposure to unhealthy fields ( the prices are a no-go though, as for a lot of mass-produceable emf-protection gimmicks ), perhaps stainless steel holds a key to proper shielding.
it consists usually mainly of iron, nickel and chromium ( the cheaper version misses the nickel but has a higher chromium content ).
the funny thing is that both iron and nickel cling to magnets, but when mixed together they don't.
the combination appears to neutralize static magnetic fields and "hyperschall", which is described as physical vibration in extreme high frequencies.
maybe it does not reduce the latter but blocks longitudinal waves instead, maybe both concepts represent the same phenomenon.
whatever, stainless steel is a material to experiment with, like putting respectively a sheet, a gauze and a fabric ( containing the alloy ) under the bed if one suspects a source of geopathic stress there or to create an undisturbed chamber ( which may however at the same time also filter out healthy natural energies, like the schumann resonance and possibly all kinds of cosmic rays that we are accustomed to and need as food ).

thanks in advance for any response.