> You can't register a ham license to a PO box Incorrect. https://wireless2.fcc.gov/helpfiles/licensemanager/commonQuestions.html > Q: Must I list a physical address, or can I just list a P.O. box? > A: You may list a PO Box and/or a physical address for a wireless application. The address will become the address of record for official FCC correspondence. This address must be kept current. Use the "Update" or "Update Licenses" feature of the ULS License Manager to update the address at any time. I've had a PO box on my ticket for 20+ years.