In the last couple of decades, solid-state device technologies, particularly solid-state electronics, have been greatly advanced and investigated for possible adoption in various terahertz (THz) applications. Particularly, there have been several successful experimental demonstrations of multitens Gbps wireless communications at above 100 GHz. Recently, we have demonstrated the 20-Gbps KIOSK instant data downloading system operating at 300 GHz with InP-based transceivers. From the work, we have learned, better understanding on the wave propagation characteristics at these frequencies is needed to improve the reliability of the data transmission. In this report, we present early investigation results on LOS THz channel responses for short range wireless communications.