I went looking for Radio Tanzania Zanzibar's English news at 1800 on 11735 and
at first thought they had dropped in frequency to 11734.9 or so but was
surprised to hear the presumed Brazilian R. Nova Visão there very weak in
Portuguese.

No trace of Zanzibar here.

dxAce
Michigan
USA

http://www.iserv.net/~n8kdv/dxpage.htm