Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB9TU callsign genealogy
Currently held by Retzlaff, Brad L
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 AB9TU's current licensee, walking backwards.
- Retzlaff, Brad LWIgranted 2009-02-18cancelled 2009-05-12
Successor callsigns
Callsigns held now by people who previously held AB9TU.
No current licensee on record previously held this callsign.