| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 76 | 52.41 % | | 162 | 54.73 % | | 2 | C C D C | AA5B | 33 | 22.76 % | | 66 | 22.30 % | | 3 | C D C C C | K0GUZ | 28 | 19.31 % | | 56 | 18.92 % | | 4 | C C D C C C | KE6GLA | 5 | 3.45 % | | 8 | 2.70 % | | 5 | C C D C C | AB9YC | 3 | 2.07 % | | 4 | 1.35 % | |
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