| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
|---|
| 1 | C D C C C | K0BIE | 63 | 30.88 % | | 65 | 30.37 % | | | 2 | C D C C | K1IG | 62 | 30.39 % | | 62 | 28.97 % | | | 3 | C C D C C | AC3KT | 29 | 14.22 % | | 29 | 13.55 % | | | 4 | C C D C C C | KA2MGE | 20 | 9.80 % | | 20 | 9.35 % | | | 5 | C C D C | AA3B | 19 | 9.31 % | | 19 | 8.88 % | | | 6 | C D C | K1C | 9 | 4.41 % | | 9 | 4.21 % | | | 7 | C C D C C / D | NA1ME/2 | 1 | 0.49 % | | 1 | 0.47 % | | | 8 | C D C C / D | W9MS/2 | 1 | 0.49 % | | 1 | 0.47 % | |
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