WO3U
Available2x1District 3
Competitive callsign — 27 applications filed with the FCC.
License HolderCLARK, BRIAN M
License ClassTechnician
Min. Class RequiredAmateur Extra
LocationSIMI VALLEY, CA
Grant DateApr 22, 2014
Expiration DateApr 22, 2024
Cancellation DateMay 7, 2026
Available for ApplicationsApr 23, 2026
WO3U is a highly sought-after 2x1 format amateur radio callsign. The license is currently held by CLARK, BRIAN M in SIMI VALLEY, CA. This callsign has attracted significant interest in the amateur radio community, with 27 vanity applications filed with the FCC. The most recent was submitted by Lewis, Matthew J on Apr 24, 2026. WO3U has 4 recorded FCC license history events.
CW & Voice Analysis
Morse Code
.-- --- ...-- ..-
CW Weight: 30 units(Light (fast to send))
Voice Phonetics
Whiskey Oscar Three Uniform
Readability: 8/10(High readability)
This callsign is available now
Requires Amateur Extra license or higher to apply for this callsign format (2x1).
License History
- License ExpiredMay 7, 2026
- License IssuedApr 22, 2014
- Vanity Callsign GrantedApr 22, 2014
- License ExpiredJul 3, 2003
Vanity Application Activity
Competing applications filed with the FCC for this callsign.