In year 2009 hamradio operators interested in history buildings started a new program called World Castle Award and started activating castles, historical buildings, fortresses and mansions.
To celebrate 10 years of program S5 WCA team got speciall call sign S510WCA
All logs will be uploaded to Clublog:
S510WCA: https://clublog.org/logsearch/S510WCA
S510WCA/p: https://clublog.org/logsearch/S510WCA/P
First activation of call sign was on 13.01.2019 from Castle Velenje S5-00126. Ops: S55X and S50LD