Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WO4D callsign genealogy
Currently held by MATTESON, JUNIOR
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 WO4D's current licensee, walking backwards.
- DELANEY, ORRIN MFLgranted 1999-05-10cancelled 2000-08-01
Successor callsigns
Callsigns held now by people who previously held WO4D.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WO4D, oldest first.
- MATTESON, JUNIOR FL1988-03-15 → cancelled 2000-03-16
- DELANEY, ORRIN M FL2020-07-22 active