| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
|---|
| 1 | C D C C C | K0QIK | 63 | 34.05 % | | 63 | 31.82 % | | | 2 | C D C C | K1OW | 46 | 24.86 % | | 46 | 23.23 % | | | 3 | C C D C C C | HQ2JML | 42 | 22.70 % | | 42 | 21.21 % | | | 4 | C C D C C | AB3CQ | 21 | 11.35 % | | 21 | 10.61 % | | | 5 | C D C | K4M | 7 | 3.78 % | | 7 | 3.54 % | | | 6 | C C D C | AA9L | 6 | 3.24 % | | 6 | 3.03 % | |
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