Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7TCO callsign genealogy
Currently held by Underhill, Colleen
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 K7TCO's current licensee, walking backwards.
- Vidaure, David AAZgranted 2018-07-10cancelled 2018-07-28
Successor callsigns
Callsigns held now by people who previously held K7TCO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K7TCO, oldest first.
- Underhill, Colleen NV2004-01-03 → cancelled 2016-01-05
- Vidaure, David A AZ2018-07-28 active