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Comparatively little work has been done on the topic of radiation damage in magnetic materials, and references concerning it will be cited herein only when pertinent to this paper. While our listing is limited, a bibliography of laboratory reports on the subject is available from the Battelle Memorial Institute. Much excellent engineering information and, in a few cases, some understanding of the mechanisms involved have grown out of the work which has been done, however, and our contribution is primarily an extension of previous investigations in the field to a few types of magnetic materials heretofore neglected.

A tilted loop technique has been developed to reduce bearing errors in loop HF directionfinder systems used on ionospherically propagated signals. Measures of signal elevation angle-of-arrival can be obtained. Theory of operation is stated. Field tests of an experimental model have verified the theory and disclosed significant improvements over a contemporary system.