ON7SA - UBA section AST
- Clubstation of Belgian UBA section AST. AST stands for Aalst, the city where we're located. We participate in many international contests with our special contestcall OTxH. The x in the call is always the last letter of the current year.
ARES El Dorado County Amateur Radio - ARRL
- Ares - an amateur radio emergency service organization consisting of licensed amateurs who have voluntarily registered their qualifications and equipment for communications duty in the public service when disaster strikes