Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WB4GRH callsign genealogy
Currently held by RAMBO JR, GUNNAR 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 WB4GRH's current licensee, walking backwards.
- Rambo, Peter GSCgranted 2023-06-24cancelled 2023-07-14
Successor callsigns
Callsigns held now by people who previously held WB4GRH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WB4GRH, oldest first.
- RAMBO JR, GUNNAR L SC1997-12-23 → cancelled 2009-12-24
- Rambo Sr, Peter G SC2023-07-14 active