BBC Radio 5 Live, one of the stations with lots to gain from the Radio Amnesty is to make a big deal about the offer.
The station will shout about its extra sports coverage from the World Cup, Wimbledon and a Test Match Special summer of cricket.
Not only will the station be much clearer on DAB, but everyone who "upgrades" their FM radio for a DAB set between Saturday 22 May and Saturday 26 June will also receive its sister digital station 5 Live Sports Extra.
Radio 5 Live Controller Adrian Van Klaveren said: "Digital radio is the best way to access an amazing summer of sport including the World Cup and cricket on 5 Live and 5 Live Sports Extra digital radio. The amnesty is a brilliant way to support a great cause in Africa. It illustrates the power of radio to provide essential information and entertainment."