47 C.F.R. § 24.134 Co-channel separation criteria.
Title 47 - Telecommunication
The minimum co-channel separation distance between base stations in different service areas is 113 kilometers (70 miles). A co-channel separation distance is not required for the base stations of the same licensee or when the affected parties have agreed to other co-channel separation distances.
Title 47: Telecommunication
PART 24—PERSONAL COMMUNICATIONS SERVICES
Subpart D—Narrowband PCS
§ 24.134 Co-channel separation criteria.