Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4BTH callsign genealogy
Currently held by Thurner II, Robert 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 W4BTH's current licensee, walking backwards.
- Thurner II, Robert MKYgranted 2013-04-17cancelled 2020-06-09
Successor callsigns
Callsigns held now by people who previously held W4BTH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4BTH, oldest first.
- SUMARA, STANLEY J FL1997-08-18 → cancelled 2009-08-19
- Thurner II, Robert M KY2020-06-09 active