At the beginning it operated on Width Modulation (Medium Wave), first with 300 watts and later with one kilowatt power. It was part of a chain, COPE,depending on the Episcopal Conference, its studios were situated on the second floor of the house, and its transmitting equipment on the Erlepater mountain that dominates the park.

A general readjustment of frequencies in Spain caused its closure in 1965, but it was reborn in 1966 in Frequency Modulation (FM). Its studios continued to be located in the Shrine but the transmitting center was transferred to Itxumendi mountain, Elosua. In 1972 Radio Loyola took over Radio Popular of San Sebastian. In 1977 the transmitter was the object of a terrorist attack, but it went on the air again the following year. A new transmitting group of 15 kv was installed in 1985.

In 1993 Radio Popular Loyola and Radio Popular of San Sebastian broke away from COPE.

At present (2003), Radio Popular Loyola, Radio Popular of San Sebastian and Radio Vitoria, which operate as a chain, broadcast all 24 hours of the day, with original programs during 20 hours (5 a.m. to 1 p.m.) and repeating some of them between 1 and 5 a.m. One third of the broadcasts is in the Basque language.

Radio Popular Loyola broadcasts in Frequency Modulation, 99.8 Mhz.

Radio Popular de San Sebastian broadcasts in Width Modulation (Medium Wave), 1,224 khz. and in Frequency Modulation, 94.8 Mhz.

Radio Vitoria broadcasts in Frequency Modulation, 98.0 Mhz.

Radio Loyola has its offices on the ground floor of the southern wing of the Shrine of Loyola and its studios in the semi-basement.