In addition to its normal professional staff, given the technical and specialized nature of the testimony by the applicant's radio frequency expert(s), the planning board or zoning board of adjustment, as the case may be, may, at the applicant's expense, hire its own radio frequency expert to review and comment upon the testimony presented by the applicant. Additionally, based upon other testimony presented by the applicant, the planning board may hire other experts with specialized areas of expertise if deemed necessary.