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For next-generation or six-generation (6G) mobile communications, the <inline-formula> <tex-math notation="LaTeX">$8\times8$ </tex-math></inline-formula> MIMO operation is envisioned for the user. In this case, as compared to the fifth-generation (5G) mid-band <inline-formula> <tex-math notation="LaTeX">$4\times4$ </tex-math></inline-formula> MIMO operation, a much larger spectral efficiency can be expected for the user, which in turn will effectively increase the user-experienced data throughput with a fixed carrier bandwidth. For such applications, to transmit eight MIMO streams for the 6G <inline-formula> <tex-math notation="LaTeX">$8\times8$ </tex-math></inline-formula> MIMO access point, a simple yet compact MIMO array formed by eight planar monopoles arranged in a circular array with radial metal walls to generate eight uncorrelated waves is presented in this study. The MIMO array operates in a wide band of 5.9-8.4 GHz, which covers the possible new 6G mobile bands in 5.925-7.125 GHz and 7.125-8.4 GHz. The targeted new 6G mobile bands are in the upper mid-band&#x2019;s lower frequency region, close to the 5G mid-band, and are expected to show similar rich multipath scattering as the 5G <inline-formula> <tex-math notation="LaTeX">$4\times4$ </tex-math></inline-formula> MIMO operation. To verify it, we apply the proposed MIMO array to transmit eight MIMO streams for the <inline-formula> <tex-math notation="LaTeX">$8\times8$ </tex-math></inline-formula> MIMO operation in a practical on-campus scenario and obtain a spectral efficiency of about 34 bps/Hz, which is about two times that of the 5G <inline-formula> <tex-math notation="LaTeX">$4\times4$ </tex-math></inline-formula> MIMO operation. The results indicate that the proposed MIMO array is promising for applications in the 6G <inline-formula> <tex-math notation="LaTeX">$8\times8$ </tex-math></inline-formula> MIMO system.