To improve the coverage with medium frequency (MF) transmitters, new results of propagation measurements have to be recognized. Experiments were made to draw ground conductivity maps and to evaluate new propagation curves. Further measurements were begun to get information about the propagation with different polarization at MF. Great interest exists in preparing new frequency ranges for practical application. First experiments were made in the 11-12 GHz area to study the influence of terrain and the troposphere on propagation. On a 56-kin beyond line-of-sight path, field strength was recorded over a one-year period and the first results of mobile measurements in terrain were compared with propagation curves.