The use of multiple antennas at each side of the radio link has demonstrated an increase in terms of data bit rate and spectral efficiency [1]. Due to this, different techniques such as spatial multiplexing and space-frequency-time techniques are being applied to MIMO (Multiple-Input Multiple-Output) systems. In order to obtain MIMO performances, most of the research studies have evaluated Uniform Linear Arrays (ULAs) for simulations and measurements. However, other considerations can be taken into account with the similar space used for the transmitter or receiver antenna array using different physical configurations. In this work, several antenna array configurations in the transmitter and the receiver have been studied and compared, in terms of MIMO channel capacity, showing that for a limited space, the linear array could be replaced for a rectangular or circular one with similar performances.