The Station The Mix service area reaches a population of over 300,000 people and covers the coast from Noosa to as far south as Caboolture. With a growing rate of over 6% per annum, the Greater Sunshine Coast is now a major regional centre and ranks as the 11th largest community in Australia. A consortium of leading Nambour business people started the Sunshine Coast Radio Centre in 1964, with the call sign 4NA.