Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0II callsign genealogy
Currently held by HEIDERSTADT, ROBERT S
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 W0II's current licensee, walking backwards.
- KC0RZLcancelledDelaware County Amateur Radio ClubIAgranted 2004-03-30cancelled 2004-05-26
Successor callsigns
Callsigns held now by people who previously held W0II.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0II, oldest first.
- HEIDERSTADT, ROBERT S IA1998-01-06 → cancelled 2002-07-28
- Delaware County Amateur Radio Club IA2026-04-29 active