Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB4KTM callsign genealogy
Currently held by GRANT, RICHARD 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 WB4KTM's current licensee, walking backwards.
- GRANT, RICHARD JGAgranted 2009-08-17cancelled 2009-09-05
Successor callsigns
Callsigns held now by people who previously held WB4KTM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WB4KTM, oldest first.
- VICKERS, CALVIN SC1995-08-09 → cancelled 2007-08-10
- GRANT, RICHARD J GA2019-07-25 active