Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GSW callsign genealogy
Currently held by WISHNESKI, FRANK G
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 K4GSW's current licensee, walking backwards.
- Williams Jr, Garr SFLgranted 2018-03-14cancelled 2018-11-02
Successor callsigns
Callsigns held now by people who previously held K4GSW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4GSW, oldest first.
- WISHNESKI, FRANK G FL2006-10-11 → cancelled 2018-10-12
- Williams Jr, Garr S FL2018-11-02 active