. Depending on the length of time and weather conditions, it may be necessary to purge the system again. Re- gardless, the system is to be pressurized to one and a half times the recommended operational pressure. The Passive Transmis- sion System supplier representative will make one final set of measurements. If there are no issues, then the service provider will confer with the buyer's representative as a final step before dismantling rigging and other tools. The following paragraphs are extracted intact from the Passive Transmission System Specification and provided for reference infor- mation and guidance to the Tower and Erection Services Provider: "Any antenna designed and supplied according to this specification will incorporate a unique mounting interface to the supporting structure. The antenna manufacturer is solely responsible for designing the antenna and 7 SPECIFYING EQUIPMENT AND SERVICES mounting interface. The antenna manufacturer will exchange design reference drawings and information with the tower and erection services provider. The antenna manufacturer will coordinate a mutually satisfac- tory mounting interface meeting all applicable EIA, SAF, and/or other applicable standards commonly used in such work by both parties. Design documents necessary to guarantee physical orientation of the vertical and horizontal radiation patterns referenced in the RFQ for each site will be provided to the buyer prior to release to manufacture of the antenna. Any work commenced, including material release, prior to approval by the buyer is at the risk of the antenna manufacturer. Ap- proval of any drawings or other information in respect to this requirement does not relieve the antenna manufacturer/supplier of the responsibility for final orientation of the antenna on the support structure. The antenna manufacturer is encouraged to design unique mounting interface to ensure final placement is in accordance with each site's unique radiation requirements. For example, if a particular antenna is either a tower top