Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0M callsign genealogy
Currently held by CHRISTENSEN, CLEO M
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 AC0M's current licensee, walking backwards.
- Thompson Jr, Glenn GCOgranted 2017-03-15cancelled 2019-11-13
Successor callsigns
Callsigns held now by people who previously held AC0M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC0M, oldest first.
- CHRISTENSEN, CLEO M FL2007-07-25 → cancelled 2019-10-22
- Thompson Jr, Glenn G CO2019-11-13 active