We have large experience with EUMETCast installations all around Spain, and
we have systems running in Malaga, Seville, Badajoz and other near places
with 1.2m. Even smaller dishes should work in good weather conditions.
Take also into account that we have installed operational systems at Canary
Islands with 1.8m dishes.
Your 1.2 dish should work, the problem has to be different according to my