A Novel Multiple Input Multiple Output Antenna (MIMO) with eight-element antennas is proposed. The MIMO system covers the frequency range 3.3 GHz to 6 GHz, making the antenna suitable for 5G sub: 6 GHz applications. The 5G bands covered by the antenna are N77 (3.3 to 4.2 GHz), N78 (3.3 to 3.8 GHz), N79 (4.4 to 5.0 GHz), and WLAN (5.15 to 5.85 GHz). The developed antenna works in these bands with a reduced mutual coupling of -15 dB between the adjacent elements of the MIMO system. The maximum isolation of 60 dB is obtained among the diagonal elements with a gain of 6 dBi and radiation efficiency of 97%. The proposed antenna is very compact with a low profile with dimensions of $\mathbf{72}\ \mathbf{mm} \times \mathbf{72}\ \mathbf{mm} \times \mathbf{1.6}\ \mathbf{mm}$ and eight antenna elements. The important MIMO parameters like CCL (Channel Capacity Loss), TARC (Total Active Reflection Coefficient), and ECC (Envelope Correlation Coefficient) are also presented to validate the performance of the proposed eight-element antenna system under the MIMO environment.