W4UO
Unknown1x2Zone 4
License HolderHOLBROOK, ROBERT A
License ClassAdvanced
Min. Class RequiredAmateur Extra
Requires Amateur Extra license or higher to apply for this callsign format (1x2).
License History
- Administrative Update AppliedAug 5, 2025
- License RenewedFeb 19, 2020
- Administrative Update AppliedJan 28, 2020
- Administrative Update AppliedJul 15, 2015
- Administrative Update AppliedApr 22, 2010
- Vanity Callsign GrantedApr 20, 2010
- License IssuedApr 20, 2010
- Internal Correction AppliedMay 29, 2009
- Internal Correction AppliedMay 29, 2009
- License RenewedDec 28, 2004
- FRN Association Letter SentDec 28, 2004
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
No competing applications detected. Monitor the FCC ULS application search to verify before filing.