examples include copper aluminum nickel plated copper wire or the like the water impermeable plastic insulation 2 can be any polymeric insulation it can be a thermoplastic polymer of polyvinylchloride polychlorotrifluoroethylene a copolymer of tetrafluoroethylene and hexafluoropropylene a copolymer of tetrafluoroethylene and perfluoropropyl vinyl ether a copolymer of tetrafluoroethylene and ethylene polyvinyl chloride and the like these polymers can be extruded around the conductive wire 1 to form an insulated wire preferably the insulation 2 is a copolymer of tetrafluoroethylene and perfluoropropylvinyl ether the water resistant i e hydrophobic yarn 3 acts in this invention as the dielectric changing element the yarn can be a polyolefin such as polyethylene polybutylene or polypropylene and is preferably coated with a silicone to increase hydrophobicity silicone coated polypropylene is available commercially from philips fiber company the yarn can also be a polytetrafluoroethylene yarn preferably an expanded porous polytetrafluoroethylene yarn the yarn is wrapped helically and closely around the insulated conductor so that water cannot penetrate it with the water repellancy in combination with the tight winding of the yarn good water repellency is imparted to the cable surrounding the aforedescribed construction is a second metallic conductor 4 that may be resistant to acid or base depending on the end use steel preferably stainless steel is preferred this second conductor must be water permeable and therefore is usually made of a braid of strands of the metal in one embodiment a 14 gauge 19 strand nickel plated copper wire was used as the central conductor 1 an insulation 2 of a copolymer of.