Go in the middle of the night from Lagos to Nairobi. From leaving Nigeria till reaching Entebbe it is incredibly hard to get to talk someone. Lucky if you do, SOP if you don't. Leaving nairobi to Benghazi is kind of the same thing. If Khartoum is awake he'll talk to you. Somewhere they can hear, but not transmit. Then you'll be an hour into Lybia before you can talk to a guy for a relay.
Niamey has a radar with quite a good coverage. They just won't tell you they got it.