Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0SIB callsign genealogy
Currently held by WYGANT, WILLIAM C
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 W0SIB's current licensee, walking backwards.
- Sibert, Jeffrey WMNgranted 2011-11-29cancelled 2021-04-09
Successor callsigns
Callsigns held now by people who previously held W0SIB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0SIB, oldest first.
- WYGANT, WILLIAM C MN2000-08-11 → cancelled 2012-11-07
- Sibert, Jeffrey W MN2021-04-09 active