canofan

Thank you Keano,Turok and Timbo for your replies.
I wonder what Likvid would have to say if he still connects.
I want to play safe and therefore shall not do such a precise transformation on an LNB; the setup on the roof will be common to all residents in the building and I must use a Quattro for the multiswitch; besides, a multiswitch allows the use of proper line amplifiers to compensate for loss in the long cables.
If my quest does not lead to a significant improvement, I shall be forced to upgrade to a CM180, deal with the wind, get twice the area and a 6db increase.
In the meantime I am very pleased with how things are progressing, thanks to your advice, guys. The question of the feedhorn is settled. The Inverto Quattro described on the satsuperstore site needs investigation; is it the golden one?