Unless you have been hearing a relay, this seems to be the mw fqy for a Costa Rican success story,
Radio María de Guadalupe (Please note the spelling). Starting regular broadcasts on March 1, 1999, their FM channel 100.3 in less than one year ranked first in San José.
E-mail is radmaria@xxxxxxxxxxxxxxx
(Website http://www.rmariadeguadalupecr.com (has live audio which does not seem to work right now)
Station manager and founder: Fray (Brother) Calvo Aguilar.