Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO0A callsign genealogy
Currently held by St Charles Amateur Radio 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 KO0A's current licensee, walking backwards.
- KC0YOBcancelledSt Charles Amateur Radio ClubMOgranted 2006-09-27cancelled 2006-12-22
Successor callsigns
Callsigns held now by people who previously held KO0A.
- HARDMAN, GORDON ECOgranted 2021-07-27
All historical holders
Every license row we've seen with the callsign KO0A, oldest first.
- HARDMAN, GORDON E CO2001-02-27 → cancelled 2001-10-19
- St Charles Amateur Radio Club MO2016-11-15 active