Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4GDU callsign genealogy
Currently held by Gibson, Samuel 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 WA4GDU's current licensee, walking backwards.
- Gibson, Samuel JINgranted 2023-04-18cancelled 2024-05-29
Successor callsigns
Callsigns held now by people who previously held WA4GDU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA4GDU, oldest first.
- WATSON, JOHN D KY2018-06-22 → cancelled 2023-02-03
- Gibson, Samuel J IN2024-05-29 active