  Admissible vectors for unitary representations of locally compact groups are
the basis for group-frame and covariant coherent state expansions. Main tools
in the study of admissible vectors have been Plancherel and central integral
decomposition, of applicability only under certain separability and
semifiniteness restrictions. In this work we present a study of admissible
vectors in terms of convolution Hilbert algebras valid for arbitrary unitary
representations of general locally compact groups.
