UK, Ireland / UK Sky TV in Poland [39]

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Sky TV in Warsaw 2018

HI all
I have recently bough a Sky Box (from skycards)
I currently have an 80cm Sat dish, i have read some older posts from 2010 that you need a 2m dish to receive the terrestrial channels, BBC, ITV, Channel 4 ect...

Is this still the case ?
is there not such a thing as a Signal booster that i could use ? or an other trick ?
If a 2m Dish really is required, dose anyone know where i can buy 1 ?
Thanks
Ash