There are, indeed, more PBS stations than there need to be, this situation created in large part by mandates to cover an entire state (in the case of state public TV networks), even when portions of that state border areas with PBS stations of their own. The Charlotte market has three PBS stations (WUNG/PBS NC, WTVI which is local to Charlotte and not part of that network, and WNSC/SCETV in Rock Hill), and the Cincinnati market has three as well, WCET, WPTO "Think TV", and WCVN Covington (KET). I have to wonder how much of WUNG and WNSC, or WCET and WCVN, is sheer duplication, in that all of these except WCET are parts of state networks which aren't going to be concerned with whether they are duplicating something from an adjacent state.