no bro.. u cant receive C-band on such a small dish of size 70 cms.
Atleast 90 cms is needed to fetch few tps of powerful C band sats.
Though, Insat 4A is pretty strong 43 dbW, U ll be really lucky to get its tps on 70 cms, yes 90 cms will fetch some tps. :tup.
I havent seen anyone getting C band sats, below 90 cm dishes.