Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA9MST callsign genealogy
Currently held by Gross, Jay 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 KA9MST's current licensee, walking backwards.
- Gross, Jay CWIgranted 2006-11-14cancelled 2007-04-04
Successor callsigns
Callsigns held now by people who previously held KA9MST.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA9MST, oldest first.
- GROSS, JAY C WI1988-11-29 → cancelled 2000-11-30
- Gross, Jay C WI2017-03-01 active