One of the important challenges facing telecommunications at terahertz frequencies is the requirement of highly directional beams to establish the link between two devices. Given that the wavelength in this region ranges from a few millimeters to a few hundreds of microns, it is clear that the geometrical features of many objects are of a size comparable to the wavelength. As a result, many commonly encountered scattering situations cannot be described using either the geometrical limit (where objects are much larger than the wavelength) or the Rayleigh limit (where objects are much smaller than the wavelength). In this chapter, we present measurements and calculations to consider this behavior and discuss the implications for wireless links between two devices.