Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0WHO callsign genealogy
Currently held by UNDERWOOD, WARREN W
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 W0WHO's current licensee, walking backwards.
- UNDERWOOD, WARREN WMOgranted 2017-09-20cancelled 2017-11-17
Successor callsigns
Callsigns held now by people who previously held W0WHO.
- UNDERWOOD, WARREN WMOgranted 2017-11-17
All historical holders
Every license row we've seen with the callsign W0WHO, oldest first.
- MALLETT, FRED E IA2004-06-29 → cancelled 2016-09-15
- UNDERWOOD, WARREN W MO2017-11-17 → cancelled 2026-04-10