This kit assumes the AlarmAgent has not been shipped to the customer and is the Indoor Enclosure model. The AlarmAgent cabinet mount Digital RM3 N antenna option is suggested when the AlarmAgent WRTU is mounted inside a cabinet and the antenna needs to be located outside of the cabinet. This option includes: Digital RM3 N Female Omni-Directional, tamper resistant antenna and all necessary hardware to remotely mount the antenna up to 36" from the AlarmAgent WRTU. Requires a 5/8" diameter hole for antenna connector.