Under our University program we developed a 4 x 4 multiple antenna test system to evaluate the MIMO channel potential in the 900MHz band. Over the last decade MIMO has gained widespread acceptance a major technology to significantly enhance spectral efficiency. Active research into “massive MIMO” for applications the mm-wave bands promise to resolve the looming spectral crowding. Some of HCDC’s MIMO measurement campaigns are documented in the reference below.P. Goud Jr., R. Hang, D. Truhachev, and C. Schlegel, “A portable MIMO testbed and selected channel measurements“, EURASIP J. Applied Signal Proc., Special Issue on Implementation Aspects and Testbeds for MIMO Systems, vol. 2006.