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In (M. Debbah, et al., 2003) a unified framework for constructing MIMO models based on the principle of maximum entropy was provided. Several MIMO directional and double directional models were derived and in each case, the mutual information was shown to have asymptotically a Gaussian behavior. Interestingly, the results were shown to be accurate, through simulations, in the finite regime with an astonishing small number of antennas. In this paper, the models are analyzed and validated based on a wideband outdoor measurement campaign carried out in Oslo during summer 2002. The measurements were performed at a center frequency of 2.1 GHz with a bandwidth of 100 MHz in three different urban scenarios: a regular street grid scenario, an open city place and an indoor cell site.