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Previous work has demonstrated theoretical increases in capacity in a multipath-rich environment when multiple antennas are used on both sides of the link. These studies generally rely on simple analytical models for the multiple-input multiple-output (MIMO) channel matrix. We have deployed a measurement platform capable of direct measurement of the MIMO wireless channel response for up to 16x16 antennas. The platform has been used to collect 4x4 and 10x10 channel data at 2.4 GHz for representative scenarios. The data suggests that the bulk statistics of the channel exhibit correlated Rayleigh fading. We show measured PDFs of the channel matrix elements, measured spatial and temporal channel correlation, and dependence of measured channel capacity on antenna polarization, antenna directivity, and the number of antennas.