Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA1ROI callsign genealogy
Currently held by LARSON SR, FREDERICK A
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 WA1ROI's current licensee, walking backwards.
- KB1PSYcancelledCAMBRIDGE MAINE MILITARY RETIREES RADIO CLUBMEgranted 2007-12-10cancelled 2008-01-01
Successor callsigns
Callsigns held now by people who previously held WA1ROI.
- LARSON SR, FREDERICK AMEgranted 2022-10-12
All historical holders
Every license row we've seen with the callsign WA1ROI, oldest first.
- LARSON SR, FREDERICK A ME1997-12-16 → cancelled 2002-04-10
- CAMBRIDGE MAINE MILITARY RETIREES RADIO CLUB ME2017-11-13 active