47 CFR 30.502: Site registration.

Point to-point links and base stations must be registered in the pursuant to procedures to be established by the Wireless Telecommunications Bureau prior to operation. Prior to filing a site registration, a licensee must successfully coordinate with the relevant co-channel Federal and non-Federal licensees. Site registrations will be processed in order of receipt unless a later filed registrant provides evidence that it completed coordination prior to the other registrant.