Vanguard Radio Network
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Vanguard Radio Network (VRN) is a Philippine radio network. Its corporate office is located at Rm. 614, Cityland Shaw Tower, St. Francis St. cor. Shaw Blvd., Ortigas Center, Mandaluyong, and its main headquarters is located at Pan-Philippine Highway, Brgy. Sangitan East, Cabanatuan. VRN operates a number of stations across regional places in Luzon under the Big Sound FM and Big Radio brands.
VRN stations
AM stations
| Callsign | Frequency | Power | Location | Owned since |
|---|---|---|---|---|
| DZXO | 1188 kHz | 5 kW | Cabanatuan | 1969 |
| DWMG | 1395 kHz | 5 kW | Solano | 1969 |
FM stations
| Branding | Callsign | Frequency | Power | Location | Owned since |
|---|---|---|---|---|---|
| Big Sound FM Cabanatuan | DWWG | 101.5 MHz | 5 kW | Cabanatuan | 1981 |
| Big Sound FM Baguio | DWBG | 95.9 MHz | 5 kW | Baguio | 1994 |
| Big Sound FM La Union | DWAA | 105.5 MHz | 5 kW | San Fernando, La Union | 1983 |
| Big Sound FM Tuguegarao | DWXY | 100.5 MHz | 5 kW | Tuguegarao | 1988 |
| Big Sound FM Cauayan | DWWC | 95.3 MHz | 5 kW | Cauayan | 1983 |
| Big Sound FM Solano | DWDC | 101.3 MHz | 5 kW | Solano | 1988 |
| Big Radio Tagbilaran | DYVA | 88.7 MHz | 5 kW | Tagbilaran | 2015 |
| Big Radio Bongabong | —N/a | 107.7 MHz | 5 kW | Bongabong | 2022 |
Former stations
| Former Branding | Callsign | Frequency | Location | Years owned | Current status |
|---|---|---|---|---|---|
| DZYG | DZYG | 1330 kHz | Cabanatuan | 1961–1972 | Closed during Martial Law. |
| Big Sound FM Lucena | DWNG | 97.5 MHz | Lucena | 1997–2014 | Acquired by Southern Tagalog Sweet Life. Currently broadcasting as Gospel Radio. |
| Big Radio Batangas | DZLC | 98.5 MHz | Lipa | 2019–2022 | Currently broadcasting as Cool FM. |
Trademark dispute
In July 2011, VRN filed a legal trademark infringement case at the Intellectual Property Office against Manuelito F. Luzon, owner of ZimZam Management which operates and manages Metro Manila station DWKY (which used the "Big Radio" brand). Luzon was accused of using the said brand without any permission from VRN, citing that VRN already owned the said brand alongside the "Big Sound FM" brand. The case was upheld in 2017, and Luzon violated Section 147 of the Intellectual Property Code of the Philippines.