It is actually in the town of Christiansted on the island of St. Croix in the U.S. Virgin islands.
WYAC also known as "Paradise 93.5 fm" features the Caribbean's best music 24 hours a day plus a morning talk program called Free Speech with Roger W. Morgan every weekday at 9:00 AM. It focuses on topics concerning the Virgin Islands and more.
If you were looking for a easternmost radio station in the contigious 48 states then my answer would have been over 120 miles off. That station would have been 90.9 FM WJIR. Located on Key West WJIR is a member of the SOS network running primarily satellite fed christian programming. http://www.sosradio.net/mainIndex.html
A mere quarter mile north is the infinitely more interesting WIIS: http://www.radiokeywest.com/
So that's the furthest East... can any reader guess which is the furthest west? South or North?