Friday's U2 360 show in Cape Town, South Africa, will air live (or close to it) across the African continent online, and also on at least two radio stations in South Africa. The online stream is set to begin at 9:15 pm local time in Cape Town (2:15 pm ET in the USA) and can be accessed at http://www.dstv.com/U2/. That page specifically says that the audio “is only available to users in Africa.”
Two radio stations will also be airing the concert: 94.5 KFM and 94.7 Highveld Stereo. Both of those stations offer online streaming, but we don't know if the streams will be turned off internationally during the concert.
We'll update this with more info if anything new develops for fans outside Africa to be able to listen on Friday.