Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WI9HRO callsign genealogy
Currently held by HRO MILWAUKEE EMPLOYEES AMATEUR RADIO CLUB
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 WI9HRO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WI9HRO.
No current licensee on record previously held this callsign.