  A model of neutrino oscillations is presented that has only three degrees of
freedom and is consistent with existing data. The model is a subset of the
renormalizable sector of the Standard-Model Extension (SME), and it offers an
alternative to the standard three-neutrino massive model. All classes of
neutrino data are described, including solar, reactor, atmospheric, and LSND
oscillations. The disappearance of solar neutrinos is obtained without
matter-enhanced oscillations. Quantitative predictions are offered for the
ongoing MiniBooNE experiment and for the future experiments OscSNS, NOvA, and
T2K.
