Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WK4L callsign genealogy
Currently held by SIEBER, JACK 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 WK4L's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WK4L.
No current licensee on record previously held this callsign.