Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD1O callsign genealogy
Currently held by GIST, DAVID 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 WD1O's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WD1O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WD1O, oldest first.
- GIST, DAVID M VA2003-02-18 → cancelled 2015-05-12
- Bates, Richard J ME2025-03-04 active