The applicant shall provide a performance bond and/or other assurances satisfactory to the Planning Board and in a form approved by the Township attorney that will cause the antennas, the supporting tower, the ancillary building enclosing related electronic equipment and all other related improvements to the land to be removed, at no cost to the Township, when the antennas are no longer operative. Any communication facility not used for its intended and approved purpose for a period of six months shall be considered no longer operative and shall be removed by the applicant or their assigns within 60 days thereof.