Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4EH callsign genealogy
Currently held by Haag, Mark 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 K4EH's current licensee, walking backwards.
- Haag, Mark EGAgranted 2012-08-14cancelled 2012-11-14
Successor callsigns
Callsigns held now by people who previously held K4EH.
- Haag, Mark EGAgranted 2026-02-27
All historical holders
Every license row we've seen with the callsign K4EH, oldest first.
- SANDEN, OSCAR E MA2001-11-14 → cancelled 2010-10-24
- Haag, Mark E GA2022-11-04 → cancelled 2026-02-27