Abstract: An attachment for a material detector device having a search antenna polarization instrument, where the material detector device has a housing with an antenna surface assigned to a detection direction, having magnets positioned opposite each other with like poles facing each other whose pole surfaces are covered by a tinned copper or oxidized aluminum layer, where the magnets and the copper or aluminum layer have at least one through bore and the magnets can be or are positioned on the housing of the material detector device extending perpendicular to the antenna surface and form a magnetic field space between the magnets in front of the antenna surface, as well as a material detector device having a rectangular housing with such an attachment for improving the reception quality. The result of this attachment is that the acoustic signals which indicate presence or absence are separated from each other more sharply.

Abstract: An attachment for a material detector device having a search antenna polarization instrument, where the material detector device has a housing with an antenna surface assigned to a detection direction, having magnets positioned opposite each other with like poles facing each other whose pole surfaces are covered by a tinned copper or oxidized aluminum layer, where the magnets and the copper or aluminum layer have at least one through bore and the magnets can be or are positioned on the housing of the material detector device extending perpendicular to the antenna surface and form a magnetic field space between the magnets in front of the antenna surface, as well as a material detector device having a rectangular housing with such an attachment for improving the reception quality. The result of this attachment is that the acoustic signals which indicate presence or absence are separated from each other more sharply.

Abstract: A housing for a search-antenna polarization instrument is formed by two housing shells (2, 3) which are plugged together in an interlocking manner. A depression can be formed on the outside of the housing, as a positioning surface (12 to 16) for an alignment instrument. Furthermore, a direction-finding groove (19, 20, 21) can be formed on a housing wall. One housing wall may also have a respectively rising extremely profile on two opposite ones of its four side edges. This improves the direction-finding accuracy of a search-antenna polarization instrument.