An applicant for an amateur radio antenna support structure which is proposed to be located within 1/2 mile of an historic resource and to exceed the maximum building height of the underlying zoning district shall obtain a recommendation from the Historical Commission and conditional use approval from the Board of Supervisors. The Historical Commission and the Board of Supervisors shall be guided in their consideration of the impact of such structure on the historic resources consistent with the identification, evaluation and assessment of effects on historic properties as set forth in Section VI of the Nationwide Programmatic Agreement, regarding the Section 106 National Historic Preservation Act Review Process, 47 CFR Part 1, App. C (September, 2004)