  While mm-wave systems are a mainstay for 5G communications, the inexorable
increase of data rate requirements and user densities will soon require the
exploration of next-generation technologies. Among these, Terahertz (THz) band
communication seems to be a promising direction due to availability of large
bandwidth in the electromagnetic spectrum in this frequency range, and the
ability to exploit its directional nature by directive antennas with small form
factors. The first step in the analysis of any communication system is the
analysis of the propagation channel, since it determines the fundamental
limitations it faces. While THz channels have been explored for indoor,
short-distance communications, the channels for {\em wireless access links in
outdoor environments} are largely unexplored. In this paper, we present the -
to our knowledge - first set of double-directional outdoor propagation channel
measurements for the THz band. Specifically, the measurements are done in the
141 - 148.5 GHz range, which is one of the frequency bands recently allocated
for THz research by the Federal Communication Commission (FCC). We employ
double directional channel sounding using a frequency domain sounding setup
based on RF-over-Fiber (RFoF) extensions for measurements over 100 m distance
in urban scenarios. An important result is the surprisingly large number of
directions (i.e., direction-of-arrival and direction-of-departure pairs) that
carry significant energy. More generally, our results suggest fundamental
parameters that can be used in future THz Band analysis and implementations.
