Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3UO callsign genealogy
Currently held by GAMBRELL, CLAUDE B
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 W3UO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W3UO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3UO, oldest first.
- GAMBRELL, CLAUDE B MD2006-07-12 → cancelled 2018-10-11
- Esquilla 336, Victor W TN2018-11-16 active