Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7SPO callsign genealogy
Currently held by BUCKMASTER, DAVID M
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 W7SPO's current licensee, walking backwards.
- BUCKMASTER, DAVID MWAgranted 2013-08-27cancelled 2015-07-17
Successor callsigns
Callsigns held now by people who previously held W7SPO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W7SPO, oldest first.
- GILDEN, CHARLES J UT1998-01-21 → cancelled 2010-01-22
- BUCKMASTER, DAVID M WA2025-05-01 active