Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9CLO callsign genealogy
Currently held by HAAS, ROBERT 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 W9CLO's current licensee, walking backwards.
- HAAS, STEVEN RINgranted 2008-09-30cancelled 2015-11-10
Successor callsigns
Callsigns held now by people who previously held W9CLO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9CLO, oldest first.
- HAAS, ROBERT F IN2003-09-17 → cancelled 2013-11-29
- HAAS, STEVEN R UT2025-08-27 active