Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4EFM callsign genealogy
Currently held by SWANSON, SHIRLEY 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 W4EFM's current licensee, walking backwards.
- SWANSON, SHIRLEY Jcancelled 1998-05-28
Successor callsigns
Callsigns held now by people who previously held W4EFM.
No current licensee on record previously held this callsign.