Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4TH callsign genealogy
Currently held by Ungemach, Robert R
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 KO4TH's current licensee, walking backwards.
- Ungemach, Robert RFLgranted 2021-09-14cancelled 2021-12-04
Successor callsigns
Callsigns held now by people who previously held KO4TH.
- PEEK JR, LEVIN JFLgranted 1997-07-14cancelled 2009-07-15