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Experimental results from an eight-channel X-band coherent MIMO radar test bed are presented. The motivation for this work is to demonstrate novel methods to allow radar systems to adapt to an increasingly crowded RF spectrum. An approach for generating constant modulus waveforms which possess spatial and/or frequency nulls, Re-iterative Uniform Weight Optimization (RUWO), is discussed. RUWO generates constant modulus radar waveforms with spatial, frequency, or space-frequency nulls for MIMO transmit arrays by utilizing the maximum signal-to-interference plus noise ratio (SINR) framework in a re-iterative fashion. The paper presents experimental results from eight channels at baseband and four channels at X-band in loop-back configuration for both cases.