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The paper describes beyond-the-horizon tropospheric wave propagation measurements made by the B.B.C. Research Department during the years 1946Â¿57. Initially, the data were used to assist the B.B.C. in planning common-frequency working within the United Kingdom for v.h.f. sound broadcasting and television, and later became a contribution towards the collection of data organized internationally by the C.C.I.R. and used by that body in the preparation of field-strength/distance curves representing average tropospheric conditions.