Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4HRO callsign genealogy
Currently held by CLARKSON, WILLARD 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 W4HRO's current licensee, walking backwards.
- Heimerl, John JVAgranted 2008-08-21cancelled 2008-09-12
Successor callsigns
Callsigns held now by people who previously held W4HRO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4HRO, oldest first.
- CLARKSON, WILLARD E MS1996-08-22 → cancelled 2008-08-23
- HEIMERL, JOHN J VA2018-06-28 active