Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WT7H callsign genealogy
Currently held by Frost, Michael G
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 WT7H's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WT7H.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WT7H, oldest first.
- LYON JR, BLAINE M ID1998-08-03 → cancelled 2001-07-15
- Frost, Michael G WA2007-11-14 → cancelled 2017-07-31
- Grandstaff, Anthony M NV2019-08-20 active