| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AIZ | 362 | 36.46 % | | 434 | 36.66 % | | 2 | C C D C C C | KA2UFP | 205 | 20.64 % | | 229 | 19.34 % | | 3 | C D C C | K0EA | 198 | 19.94 % | | 250 | 21.11 % | | 4 | C C D C C | AA0RC | 119 | 11.98 % | | 144 | 12.16 % | | 5 | C C D C | AB4Z | 84 | 8.46 % | | 96 | 8.11 % | | 6 | C D C | K0B | 22 | 2.22 % | | 28 | 2.36 % | | 7 | C D C C C D C | N4EAR3A | 1 | 0.10 % | | 1 | 0.08 % | | 8 | C D C D | W3A0 | 1 | 0.10 % | | 1 | 0.08 % | | 9 | C D / C C D C C C | W5/DU1ANA | 1 | 0.10 % | | 1 | 0.08 % | |
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