Radio Prague not being on shortwave has not stopped me from listening, although I do so far less often than when it was simply a case of tuning in. I do listen online periodically via http://www.radio.cz/ or through the World Radio Network relay http://www.wrn.org/
The station has always covered Christmas and the New Year holidays very well, conjuring up a magical atmosphere that can take you back to childhood in some ways, while retaining a 21st century edge to proceedings.
Try some of these links for a direct route to Wenceslas Square in Prague, where the snow will doubtless be laying deep, crisp and even. A Czech Christmas and its traditions at http://www.radio.cz/en/static/christmas/
A fascinating background to Czech carols is at http://www.radio.cz/en/section/special/czech-carols-from-christmas-past-and-present and the Radio Prague choir, consisting of broadcasters rather than choristers, is a lovely festive offering. They sound rather good to me http://www.radio.cz/en/static/christmas/carols If you think so too then drop them an email to thank them firstname.lastname@example.org