Spring 2026 Station Information Profile (SIP) on File with Nielsen
| Call Letter: | WMSW-AM | |
| Frequency: | 1120 | |
| Station Name: | RADIO ONCE 1120 AM | |
| Format: | News Talk Information | |
| Network(s): | BBC | |
| City of License: | HATILLO | |
| County of License: | Hatillo | |
| Mailing Address: | PO BOX 140961 ARECIBO, PR 00614 |
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| Phone: | 787-879-4094 | |
| Fax: | 787-880-0441 | |
| URL Address: | www.radioonce.com | |
| Broadcasts in HD: |
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| Internet Streams: |
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Spring 2026 Reminder:
You no longer need to submit program information to Nielsen.
To view the simulcast combos that have requested Total Line Reporting, click here .