We show that the interaction of a gravitational wave with a spherical
resonant-mass antenna changes the antenna's shape to that of an ellips
oid. These changes in shape always determine the direction of the inco
ming wave and may provide information on the wave's polarization. We p
resent a new approach for determining the position of astrophysical so
urces of gravitational waves which involves fewer calculations than in
earlier methods. We also show how the measured quantities relate to t
he energy density of the wave.