Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD4OY callsign genealogy
Currently held by GLEICH, GERALD C
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 AD4OY's current licensee, walking backwards.
- KD4CBZno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held AD4OY.
No current licensee on record previously held this callsign.