medium wave
From Longman Dictionary of Contemporary EnglishRelated topics: Broadcastingmedium waveˈmedium ˌwave noun [uncountable] (written abbreviation MW) TCBa system of radio broadcasting using radio waves between 100 and 1,000 metres in length → long wave, FMExamples from the Corpusmedium wave• That's why you can no longer get Radio 2 or Radio 3 on medium wave.