Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4MA callsign genealogy
Currently held by Armbrust, Mary M
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 WA4MA's current licensee, walking backwards.
- Armbrust, Mary MFLgranted 2016-10-07cancelled 2017-02-10
Successor callsigns
Callsigns held now by people who previously held WA4MA.
- ACHTERHOF, MARVIN LVAgranted 2000-10-07cancelled 2001-02-13
All historical holders
Every license row we've seen with the callsign WA4MA, oldest first.
- ACHTERHOF, MARVIN L VA1997-09-17 → cancelled 2000-10-07
- Armbrust, Mary M FL2017-02-10 active