Almost all mobile communication systems today use spectrum in the range of 300 MHz – 3 GHz. In this paper, the authors reason why the wireless community should start looking at the 3 – 300 GHz spectrum for mobile broadband applications. As the number of tablets and Smartphones are gaining high popularity, the now available frequency bands will not be able to satisfy the needs of customers, so they have to exploit the millimeter wave bands ranging from 3 GHz to 300 GHz.