I think it varies according to which of the particular Astra satellites channels are broadcast from.
BBC, BBC2, ITV, C4 are all broadcast on a satellite with a very small footprint. When I was in Prague I could pick up most Sky channels with a regular dish, but not the big four.
I saw a map somewhere showing that you would need a 3.5m dish to pick up these channels from Alexandria, but maybe for the other Sky channels you would 'only' need a 2.4m dish.
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