Given the limited spectrum allocated to cellular mobile radio, the authors consider the use of microwave frequency bands where larger bandwidth allocations may be feasible. A radio network of 'microcells' has been proposed for such bands. They have conducted a propagation experiment at 11 GHz to characterise such communication channels in various environments. Results are given for rural and semi-urban environments, where propagation is found to be dominated by interference between the direct ray and a roadway-reflected ray.<<ETX>>