| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AIZ | 57 | 33.93 % | | 57 | 33.53 % | | 2 | C C D C C C | KA9NOH | 41 | 24.40 % | | 41 | 24.12 % | | 3 | C D C C | K0SW | 32 | 19.05 % | | 34 | 20.00 % | | 4 | C C D C C | AB3LK | 19 | 11.31 % | | 19 | 11.18 % | | 5 | C C D C | AE9U | 13 | 7.74 % | | 13 | 7.65 % | | 6 | C D C | K0B | 5 | 2.98 % | | 5 | 2.94 % | | 7 | C D C D | W3A0 | 1 | 0.60 % | | 1 | 0.59 % | |
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