Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD9O callsign genealogy
Currently held by Olivero, Rachel 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 AD9O's current licensee, walking backwards.
- Osowski, Clint ETXgranted 2016-10-04cancelled 2021-09-03
Successor callsigns
Callsigns held now by people who previously held AD9O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AD9O, oldest first.
- DANIELSON, ARTHUR L IL1997-05-20 → cancelled 2009-05-21
- Olivero, Rachel A MD2009-07-03 → cancelled 2021-07-07
- Osowski, Clint E TX2021-09-03 active