Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA1AT callsign genealogy
Currently held by DI SISTO, GREGORY G
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 AA1AT's current licensee, walking backwards.
- Sudbay, Patrick SMAgranted 2005-05-05cancelled 2005-06-01
Successor callsigns
Callsigns held now by people who previously held AA1AT.
- DI SISTO, GREGORY GFLgranted 2020-04-30
All historical holders
Every license row we've seen with the callsign AA1AT, oldest first.
- DI SISTO, GREGORY G CT1992-06-09 → cancelled 2000-05-09
- Sudbay, Patrick S MA2025-04-22 active