Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KG9QO callsign genealogy
Currently held by UNDERHILL, DAVID E
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 KG9QO's current licensee, walking backwards.
- UNDERHILL, DAVID EINgranted 1991-12-03cancelled 2000-02-12
Successor callsigns
Callsigns held now by people who previously held KG9QO.
- Underhill, David EINgranted 2022-10-26