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This presentation of millimetric propagation investigations at Bradford University will avoid a detailed discussion of results at the individual event level. Instead we shall try to give a broad overview of all the experiments and to point out the implications of their results in general terms. We shall discuss first two strictly millimetric (greater than 30 GHz) terrestrical experiments, and then the slant path investigations where the measurements are made below 30 GHz. The results of these are significant for the higher frequencies either because they can be frequency scaled or because they consist of inferences about the physical nature and behaviour of scattering particles. Almost all the work to be discussed relates to the effects of hydrometeors or other issues relating to particles; the contribution will end with a personal view of outstanding issues relating to particle effects in the millimetric domain.