  We propose a new model for the nature of the low temperature phase of a
geometrically frustrated antiferromgnet (AFM) with a Kagome lattice,
SrCr$_{8-x}$Ga$_{4+x}$O$_{19}$. We propose that the long-range dipolar
interaction between the magnetic Cr$^{3+}$ ions introduces correlations in
their dynamics. The dipolar ground-state has the spins performing correlated
zero-point oscillations in a coherent state with a well defined global phase
and a complex order-parameter (i.e. Off-Diagonal Long Range Order). We
calculate the magnon excitations of such a dipolar array and we find good
agreement with the spin-wave velocities infered from measurements of the
specific-heat. Various experimental properties of these materials are naturally
explained by such a model.
