Between December 1st and December 25th 2010, whenever I am in, Zender Postoffice will be streaming non-stop Christmas music.
Between 1st and 17th, it will most likely be on from 16:00-21:00 UTC on weekdays, apart from Tuesdays and Thursdays, in which case it will probably be 17:00-21:00. The most likely time for broadcasting is 16:00-18:00 UTC.
At weekends it may be on during the day. There may be thge occasional live, non-christmas programme, especially on Sunday nights.
To find out when on air, go here: http://www.easyshopdiscountzone.com/radio/pirate/chat.html