Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W8SBM callsign genealogy
Currently held by HORN, DAVID A
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 W8SBM's current licensee, walking backwards.
- Langendonk, David PMIgranted 2012-11-30cancelled 2013-12-13
Successor callsigns
Callsigns held now by people who previously held W8SBM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W8SBM, oldest first.
- HORN, DAVID A OH1995-03-16 → cancelled 2006-08-18
- Langendonk, David P MI2024-03-01 active