| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AUG | 211 | 36.89 % | | 216 | 36.42 % | | 2 | C D C C | K0PL | 116 | 20.28 % | | 123 | 20.74 % | | 3 | C C D C C C | KB1DNI | 110 | 19.23 % | | 115 | 19.39 % | | 4 | C C D C C | AA0RW | 71 | 12.41 % | | 73 | 12.31 % | | 5 | C C D C | AB4Z | 50 | 8.74 % | | 52 | 8.77 % | | 6 | C D C | K1B | 12 | 2.10 % | | 12 | 2.02 % | | 7 | C D C C C D C | N4EAR3A | 1 | 0.17 % | | 1 | 0.17 % | | 8 | C D / C C D C C C | W5/DU1ANA | 1 | 0.17 % | | 1 | 0.17 % | |
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