; recommendation (1) In general Not later than two years after the date of the enactment of this section and annually thereafter until the Program terminates pursuant to subsection (e), the Under Secretary shall submit to Congress a report on the implementation of the Program, including an evaluation of each technology-based mitigation solution identified for priority consideration pursuant to subsection (c), and a recommendation regarding additional identification and testing of new technologies based on such consideration. (2) Final recommendation Not later than five years after the date of the enactment of this section, the Under Secretary shall provide to Congress a recommendation on whether additional research, testing, and development through the Program established under subsection (a) is needed, and a determination of whether a cessation of field research, testing, development and evaluation is appropriate. (e) Termination The authority of the Under Secretary to carry out the Program shall terminate on the earlier of— (1) September 30, 2029; or (2) one year after the date on which the final recommendation required under subsection (d)(2) is submitted by the Under Secretary. (f) Definitions In this section: (1) Beam blockage The term beam blockage means a signal that is partially or fully blocked due to an interference. (2) Ghost echo The term ghost echo means radar signal reflectivity or velocity return errors in radar data due to the proximity of an interference. (3) Interference The term interference includes the following: (A) a wind turbine that could limit the effectiveness of a weather radar system; (B) any building that disrupts or limits the effectiveness of a weather radar system