Radio spectrum, part of the wider electromagnetic spectrum, ranges from Very Low Frequency (VLF) to optical frequencies and beyond. It is the soft infrastructure that enables wireless connectivity between places, people and devices through mobile phones, navigation systems, sensor and radar systems, for example. All of these radio systems are integral to the national infrastructure and defence. Extensive growth is anticipated in the field through the development of new radio-system applications to support what is becoming known as the fourth industrial revolution. The MSc in Wireless Communications and Radio Frequency Systems at Aberystwyth University covers underlying theory and applications of the radio spectrum, and involves core theory for the field, research-led themes, practical applications, and engineering skills modules.