How long is a piece of string questions.
The larger the dish, the greater the signal capture, so yes, a 1.2m dish will have greater resistance to rain fade than an 80cm dish, but there's so many variables it's difficult to put an actual figure on it.
Nothing can be guaranteed.
Even 15m solid uplink dishes can lose signal in very heavy rain.
Most feeds are received by networks typically on 5m solid dishes.
Feed signals are not intended to be received direct to homes and they are a lot weaker in signal strength compared to signals intended to be received DTH.
Location can also make a huge difference to received signal strength, with some locations requiring a 1.2m dish to receive DTH transmissions.
1/. So in simple terms, no matter how big a dish you use, there is no guarantee against rain fade, regardless of transmission type, but feeds are typically more prone to signal loss on smaller dishes.
2/. The best you can do is use the biggest dish you possibly can.
3/. A commercial-specification single polarity PLL LNB will also add sensitivity, selectivity and stability to received signals.
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