The Cuban stations, V2, M8, and SK01, are day of the week specific. That means each day might have a different station on a different frequency at any specific time, such as 0500. The 0500 time slot is one of the more stable. The last data I have lists for the 0500 slot (days and times are UTC, list includes possibles and backups):
Monday 5898
Tuesday 12180/13380/5898
Wednesday 12180/13380/5898
Thursday 13380/5898
Friday 12180/13380/5898
Saturday 5898
Sunday 5898
You'll note 5898 listed every day, however several of those are "possible", not 100% of the time.