Spectrum utilization efficiency (SUE) is important since the spectrum is a limited resource that has economic and social value, and because demands for spectrum are increasing rapidly in most frequency bands. In recent years, many improved and emerging radio technologies, made possible considerable improvement in the efficient use of the spectrum. The new techniques help in accommodating the growing demands for spectrum allocation and use. The measure of spectrum utilization efficiency is different for different types of systems or services. For example, the calculation of spectrum efficiency for point-to-point systems is different than that for satellite or land mobile systems. Hence the comparison of spectrum efficiency can only be done between similar types of systems and within a specific frequency band or channel. It would also be beneficial to conduct the comparison of spectrum efficiency or utilization of the same system over time to see if there is any improvement in the specific area under study.