 Rádio Sim is available on medium wave, covering most of mainland Portugal, as well as on FM in some regions.RR (Rádio Sim)'s most powerful medium-wave transmitter – operating on a frequency of 594 kHz with a power of 100 kW (although currently using 60 to 80 kW) – is situated near the village of Muge, some 75 km north-east of Lisbon.It is a 259-meter-high guyed mast radiator and also Portugal's tallest structure.