| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0USA | 16 | 32.65 % | | 16 | 32.00 % | | 2 | C D C C | K4YR | 10 | 20.41 % | | 10 | 20.00 % | | 3 | C C D C C C | KC0RSE | 9 | 18.37 % | | 10 | 20.00 % | | 4 | C C D C C | AA4CW | 8 | 16.33 % | | 8 | 16.00 % | | 5 | C D C | K1R | 3 | 6.12 % | | 3 | 6.00 % | | 6 | C C D C | KX4I | 3 | 6.12 % | | 3 | 6.00 % | |
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