47 C.F.R. §76.92
With respect to network programming, the geographic zone within which the television station is entitled to enforce network non-duplication protection and priority of shall be that geographic area agreed upon between the network and the television station. In no event shall such rights exceed the area within which the television station may acquire broadcast territorial exclusivity rights as defined in §73.658(m) of this Chapter, except that small market television stations shall be entitled to a secondary protection zone of 32.2 additional kilometers (20 additional miles). To the extent rights are obtained for any hyphenated market named in §76.51, such rights shall not exceed those permitted under §73.658(m) of this Chapter for each named community in that market.