  Angular fluctuations of stochastic gravitational wave backgrounds (GWB)
produced by extragalactic astrophysical sources are calculated. The angular
properties of such backgrounds are determined by the large scale structure of
Universe (galaxy clustering). The evolution of star formation rate with
redshift is taken into account. Fluctuations of the metric strain amplitude
associated with such noises at angular scales of about one degree are found to
be of order 5-20% slowly growing toward smaller angular scales. This feature
can be potentially used to separate astrophysical GWB from cosmological ones in
future experiments.
