There's supposed to be a sidelobe of Astra 2A in Africa,passing through Benin if I remember correctly.
All normal transmit receive parabolic dishes have sidelobes to a greater or lesser degree,this one must do as well
though obviously a long way down on the main lobe.I don't think we'll get any hard and fast figures from the designer of this antenna though (Dr D'eath wasn't it from that TV Programme) but he'll know about them for sure,it'll be an SES Astra top secret...
Astra 1A years ago had one in Southern Africa...way off beam and then there was the German guy in South America getting signals at times from some of the satellites at 19 East
Hugh