An apparatus, comprising: at least two non-coinciding arrangements disposed in an at least two axes Cartesian coordinate system such that each arrangement having a non-zero projection on a respective axis from among said at least two axes; characterized in that each one of said arrangements includes at least one pair of oppositely directed, spaced apart, co-axial radiating-capable elements (51a, 51b) extending along a third axis, each of said elements being hollow with internal space, and being slotted throughout its entire longitudinal extent; a first circuitry coupled to said arrangement and being configured to sense an electric field projection along said third axis and to convey it to a first feeding terminal; a second circuitry coupled to at least one slot of said arrangement that includes passive elements that include at least one magnetic element accommodated within the internal spaces of said at least one pair of co-axial radiating-capable elements and extending along a major portion of the elements' longitudinal extent wherein said magnetic element includes a multi-turn loop over a ferrite rod; said second circuitry is configured to sense a magnetic field projection along said third axis and to convey it to a second feeding terminal; each one of said arrangements has a first longitudinal dimension and is capable of sensing a magnetic field projection along said third axis and an electric field projection along said third axis in a decade frequency band where the said first longitudinal dimension is smaller than λ MIN / 10 and where λ MIN corresponds to the highest frequency of said frequency band. at least two non-coinciding arrangements disposed in an at least two axes Cartesian coordinate system such that each arrangement having a non-zero projection on a respective axis from among said at least two axes; characterized in that each one of said arrangements includes at least one pair of oppositely directed, spaced apart, co-axial radiating-capable elements (51a, 51b) extending along a third axis, each of said elements being hollow with internal space, and being slotted throughout its entire longitudinal extent; a first circuitry coupled to said arrangement and being configured to sense an electric field projection along said third axis and to convey it to a first feeding terminal; a second circuitry coupled to at least one slot of said arrangement that includes passive elements that include at least one magnetic element accommodated within the internal spaces of said at least one pair of co-axial radiating-capable elements and extending along a major portion of the elements' longitudinal extent wherein said magnetic element includes a multi-turn loop over a ferrite rod; said second circuitry is configured to sense a magnetic field projection along said third axis and to convey it to a second feeding terminal; each one of said arrangements has a first longitudinal dimension and is capable of sensing a magnetic field projection along said third axis and an electric field projection along said third axis in a decade frequency band where the said first longitudinal dimension is smaller than λ MIN / 10 and where λ MIN corresponds to the highest frequency of said frequency band.