  Wireless Network-on-Chip (WNoC) has emerged as a promising alternative to
conventional interconnect fabrics at the chip scale. Since WNoCs may imply the
close integration of antennas, one of the salient challenges in this scenario
is the management of coupling and interferences. This paper, instead of
combating coupling, aims to take advantage of close integration to create
arrays within a WNoC. The proposed solution is opportunistic as it attempts to
exploit the existing infrastructure to build a simple reconfigurable
beamforming scheme. Full-wave simulations show that, despite the effects of
lossy silicon and nearby antennas, within-package arrays achieve moderate gains
and beamwidths below 90\textsuperscript{o}, a figure which is already relevant
in the multiprocessor context.
