Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4MAT callsign genealogy
Currently held by Bartucco, Robert J
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 KO4MAT's current licensee, walking backwards.
- MATHESON, AUBREY LGAgranted 2021-07-06cancelled 2023-05-31
Successor callsigns
Callsigns held now by people who previously held KO4MAT.
- Bartucco, Robert JFLgranted 2021-02-27cancelled 2021-09-18
All historical holders
Every license row we've seen with the callsign KO4MAT, oldest first.
- Bartucco, Robert J FL2021-02-08 → cancelled 2021-02-27
- MATHESON, AUBREY L GA2023-05-31 active