Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4MSA callsign genealogy
Currently held by CALLIHAN SR, ROBERT B
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 W4MSA's current licensee, walking backwards.
- Muir, Martha AGAgranted 2011-07-12cancelled 2013-03-26
Successor callsigns
Callsigns held now by people who previously held W4MSA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4MSA, oldest first.
- CALLIHAN SR, ROBERT B KY1996-12-02 → cancelled 2008-12-03
- Muir, Martha A GA2023-03-01 active