Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO1M callsign genealogy
Currently held by COMFORT, FRANK
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 KO1M's current licensee, walking backwards.
- Clark, Michael KRIgranted 2003-10-28cancelled 2008-03-11
Successor callsigns
Callsigns held now by people who previously held KO1M.
- Harnage, Michael EVAgranted 2023-11-17
All historical holders
Every license row we've seen with the callsign KO1M, oldest first.
- COMFORT, FRANK MA1988-02-16 → cancelled 2000-02-17
- Harnage, Michael E VA2003-07-12 → cancelled 2004-02-14
- Clark, Michael K RI2018-06-08 active