Hmmm, good question.  The emerging convention at Wikipedia:WikiProject Radio Stations is to follow call letters with a suffix identifying the article as a broadcast station (whether as part of the actual call, i.e. -FM, -TV, etc., or implied as in (AM) ).  The initial consensus here, however, seems to be to keep the page at WNCI.  Call for votes?   

My vote, incidentally, would be move to WNCI-FM.  Even though WNCI is unique among radio station call letters, that doesn't necessarily mean it's unique among encyclopedia subjects.  WLAF would be one example where four letters beginning with a W does not necessarily indicate a broadcasting station.  WNCI can, and likely will, always redirect to the article.