Checking around WWV on 25MHz which was solid copy, spotted some cw on 24.708MHz at 2213z 7 July 2018, but too brief to id perhaps Sporadic E (and not 12m ham) related...
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24711.7: FF DAKAR ? Spurs at 24704.2/24708/24715.2/24719.3 [1]
24711.7 RFTJ - French Forces, Dakar, Senegal... [2]
[1] July 2002 /POP'COMM / p.59
[2] April 2004/MONITORING TIMES/ p.36