Have them make the conduit as large as possible. 3/4" inch was pretty tight for me, I would have been happier with 1 inch or larger.
5 RG6 cables will fit in a 3/4" conduit (EMT) but if there are any connector parts (i.e. connect pipe to box) it will cut it down to 4 cables.
From the attic to the basement I have the equivalent of a 4" x 4" conduit, and believe it or not it is getting tight. With all the RG6, ethernet, phone, and alarm system wires, it would be better if it were larger.
As a minimum for satellite you will need an RG6 to each TV from the attic. Two is better since you can send signal back up to distribute around the house.