170 000 kaikkiaan 720 000 (24%) radioamatööristä kuuluu ARRL:ään, Yhdysvaltain radioamatööriliittoon

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The American Radio Relay League, Incorporated (ARRL) is the representative of Amateur Radio in the United States. There are more than 720,000 Amateur Radio operators licensed by the FCC. ARRL’s membership of approximately 170,000 includes the most active and dedicated Amateur Radio operators.