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The future of global connectivity relies on the seamless integration of satellite and terrestrial networks. Recent advancements have enabled terrestrial devices to connect directly to satellites, while high-speed 5G millimeter-wave links offer a promising solution for backhauling ground station data. This paper introduces the concept of joint satellite and terrestrial networks (Jointnets), which necessitates both coexistence and backhaul. In this framework, satellites and ground stations act as relays between terrestrial base stations and devices, removing coverage barriers and providing global connectivity. However, the significant spectrum overlap between 27.5 to 30.0 GHz leads to co-channel interference degrading efficiency or causing complete link failure. Existing approaches only focus on coexistence, resulting in spectrum inefficiency and coverage gaps. We present mmSubArray: Array of Sub-band Phased Arrays, a novel solution utilizing commercial off-the-shelf phased arrays to achieve full-spectrum utilization and enable Jointnets. Through extensive simulations and real-world measurements, we demonstrate the interference challenges and evaluate the efficacy of our approach. Additionally, we have open-sourced our Python simulator and hardware implementation source codes, providing valuable tools for industrial deployment and future research.