Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF7SP callsign genealogy
Currently held by RETZ, WILLARD J
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 KF7SP's current licensee, walking backwards.
- WB7FBDno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KF7SP.
- RETZ, WILLARD JUTgranted 2019-09-23