Omega Tower Trelew, Radio navigation tower in Trelew, Argentina.

Omega Tower Trelew was a radio mast facility near the city that served as a tall steel structure for long-wave radio transmission. The installation functioned with ground-insulated design and supported navigation signals across large maritime and aeronautical areas.

In 1973 the Argentine Navy's Dirección General del Material Naval put the tower out to public tender, published in the Boletín Oficial on 12 April with a budget of 17,661,814 pesos ley 18.188. The mast was built in the 1970s as Station F of the US Navy's Omega Navigation System, one of several transoceanic very-low-frequency sites. Controlled Demolition, Inc. imploded it on 23 June 1998, after GPS had made the network obsolete.

The tower was Station F of the Omega Navigation System, a global radio network the United States Navy designed to fix the position of its ships and aircraft. Similar masts stood in Norway, Hawaii, Australia and Japan. When it was demolished in 1998, few people knew it existed.

The site was located in an area outside the city and was never open to public visits. Visitors today will find an empty landscape where the tower once stood, with no remaining structure to observe.

Standing at 366 meters, it was the tallest structure in South America at its peak. The 1998 demolition was one of the largest controlled demolitions ever performed and attracted engineers from around the world.