This paper applies Shannon’s equation to model channel capacity at mm-wave frequencies. The impact of signal-to-noise ratio (SNR) is to limit channel capacity at some frequency for an application, and the capacity declines at higher frequencies as the SNR decreases due to intrinsic noise sources, component characteristics, modulation schemes, aspects of receiver design, system impairments, distance and other factors. With 6G applications in mind, the authors present significant insights and system considerations for optimal channel capacity for frequencies up to 300 GHz including the application of dielectric waveguides (DWG), and improvements from equalization and predistortion techniques. Future work exists to consider the impact of energy efficiency in the channel capacity models