Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA1OA callsign genealogy
Currently held by Drennan, Robert 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 KA1OA's current licensee, walking backwards.
- KB1SNNcancelledNorthern Berkshire Amateur Radio ClubMAgranted 2009-06-02cancelled 2009-07-03
Successor callsigns
Callsigns held now by people who previously held KA1OA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA1OA, oldest first.
- Drennan, Robert E MA2004-09-30 → cancelled 2009-03-19
- Northern Berkshire Amateur Radio Club MA2019-04-09 active