Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0BM callsign genealogy
Currently held by GANN, WILLIAM C
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 W0BM's current licensee, walking backwards.
- CAHILL, BYRON PMNgranted 2006-05-04cancelled 2008-09-03
Successor callsigns
Callsigns held now by people who previously held W0BM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0BM, oldest first.
- GANN, WILLIAM C FL1996-07-31 → cancelled 2008-08-01
- CAHILL, BYRON P MN2018-06-06 active