Apparatus for reducing net distributed magnetic radiation in front of a cathode ray apparatus screen (14). In such cathode ray apparatus a deflection coil (16,18) is provided having axially aligned (22,24, 26,28) and circumferentially aligned (32,34,36,38) wire segments, relative to the central axis thereof, producing a distributed magnetic field in front of the screen which is undesirable. The invention provides a magnetic shunt (50) disposed between the deflection coil and the screen, the shunt comprising a magnetically permeable material having its configuration and position relative to the coil optimized to maximize cancellation of the net distributed magnetic field at a selected point in space in front of said coil, so as to provide optimised overall magnetic field reduction through the action of the shunt.
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