Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W6KO callsign genealogy
Currently held by Brentwood Contesting Club
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by W6KO's current licensee, walking backwards.
- KN6UNMcancelledBrentwood Contesting ClubCAgranted 2022-06-04cancelled 2022-06-25
Successor callsigns
Callsigns held now by people who previously held W6KO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6KO, oldest first.
- CALLAHAN, EDWARD C CA1988-05-17 → cancelled 2000-05-18
- RICHARDS, ROBERT L CA2010-05-01 → cancelled 2022-06-07
- Brentwood Contesting Club CA2022-06-25 active