Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WB4JFH callsign genealogy
Currently held by Harkcom, Jeffrey F
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 WB4JFH's current licensee, walking backwards.
- Harkcom, Jeffrey FFLgranted 2025-07-08cancelled 2025-07-26
Successor callsigns
Callsigns held now by people who previously held WB4JFH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WB4JFH, oldest first.
- GIEROW, PAUL A AL2004-07-16 → cancelled 2016-07-19
- Harkcom, Jeffrey F FL2025-07-26 active