  We construct a new, simple phenomenological model along the lines of AdS/QCD.
The essential new ingredient is the brane-antibrane effective action including
the open string tachyon proposed by Sen. Chiral symmetry breaking happens
because of tachyon dynamics. We fit a large number of low-spin meson masses at
the 10%-15% level. The only free parameters involved in the fits correspond to
the overall QCD-scale and the quark masses. Several aspects of previous models
are qualitatively improved.
