Two of the bigger Finnish squads, LLv34 and Leijonat, both fly for Rooks. Furthermore almost every "freelance" Finn pilots is also flying for rooks. They are all tuned to the same channel, sometimes just for chatting, other times for more organized operations.
Since all on the channel are Finns, except me and my brother, the ammount online is very time-dependant, varying from 0-30.
If Camo is online you surely has seen him claim this and that base to the "Uberfinns Perkele (+friends)".