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WMSW-AM logo.png
City Hatillo, Puerto Rico
Branding Radio Once
Frequency 1120 kHz
First air date December 24, 1980
Format News/Talk
Power 2,600 watts (day)
5,000 watts (night)
Class B
Facility ID 3257
Transmitter coordinates 18°28′15″N 66°50′24″W / 18.47083°N 66.84000°W / 18.47083; -66.84000
Affiliations Radio Isla
Owner Aurora Broadcasting Corporation
Sister stations WNIK, WNIK-FM
Website http://www.radioonce.com/

WMSW (1120 AM, "Radio Once") is a radio station licensed to serve Hatillo, Puerto Rico. The station is owned by Aurora Broadcasting Corporation.[1] It airs a News/Talk format.[2]

The station was assigned the WMSW call letters by the Federal Communications Commission on December 31, 1979.[3]


  1. ^ Jacobs, George (2007). National Radio: Puerto Rico (US Associated). World Radio TV Handbook 2007: The Directory of Global Broadcasting. Billboard Books. pp. 305–306. ISBN 0-8230-5997-9. 
  2. ^ "Station Information Profile". Arbitron. Archived from the original on March 1, 2010. 
  3. ^ "Call Sign History". FCC Media Bureau CDBS Public Access Database. 

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