| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AUG | 174 | 38.93 % | | 176 | 38.77 % | | 2 | C D C C | K0PL | 89 | 19.91 % | | 90 | 19.82 % | | 3 | C C D C C C | KB1HYL | 71 | 15.88 % | | 73 | 16.08 % | | 4 | C C D C C | AA0RW | 59 | 13.20 % | | 61 | 13.44 % | | 5 | C C D C | AB4Z | 41 | 9.17 % | | 41 | 9.03 % | | 6 | C D C | K1B | 11 | 2.46 % | | 11 | 2.42 % | | 7 | C D C C C D C | N4EAR3A | 1 | 0.22 % | | 1 | 0.22 % | | 8 | C D / C C D C C C | W5/DU1ANA | 1 | 0.22 % | | 1 | 0.22 % | |
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