Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB0APA callsign genealogy
Currently held by GROENHOF, JACOB J
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 KB0APA's current licensee, walking backwards.
- Windseth, Donald EMNgranted 2025-12-24cancelled 2026-01-23
Successor callsigns
Callsigns held now by people who previously held KB0APA.
- GROENHOF, JACOB JCOgranted 2020-06-20
All historical holders
Every license row we've seen with the callsign KB0APA, oldest first.
- GROENHOF, JACOB J CO1997-03-25 → cancelled 2000-08-08
- Windseth, Donald E MN2026-01-23 active