Look up one of the many sites on the Astra satelite etc. The Sky (2D) footprint just about goes as far south as Le Mans for a small dish. Looks like you'll need a metre dish in the Dordogne.
Motors TV appears to be on Astra 1G, which may be a smaller footprint/less power. It was painful getting any further.
So if I buy a box and a dish, without a Sky card, can I watch the free channels, such as Motors, Eurosport and the German porno channels?