Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD4TH callsign genealogy
Currently held by SHOEMAKER, STEPHEN S
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 AD4TH's current licensee, walking backwards.
- KD4JTUno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held AD4TH.
- SHOEMAKER, STEPHEN SSCgranted 2025-06-21