Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4KOA callsign genealogy
Currently held by TILLIS, JAMES B
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 W4KOA's current licensee, walking backwards.
- BILLINGTON, SUSAN EFLgranted 2005-12-09cancelled 2007-03-06
Successor callsigns
Callsigns held now by people who previously held W4KOA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4KOA, oldest first.
- TILLIS, JAMES B FL1994-01-04 → cancelled 2006-01-05
- BILLINGTON, SUSAN E NH2017-02-03 active