You can use the coax as long as it is at least RG6 as Bill stated. You might even get lucky and find out it is RG11. As he said make sure you know what is what as to the runs of coax. If you start with a 90cm dish you should be just fine for Ku reception with no need to upgrade the dish later.
I pulled the DN dish off my house when I bought it just because I won't have such a thing
I found FTA searching for
Spanish language channels and have been very happy with the results. For the investment costs involved with the systems sold by
Sadoun I think you will be pleasantly surprised with what you are able to receive.
More and more channels are moving to AC-3 (Digital Dolby) and the Fortec's pass the stream but do not decode it. A surround sound receiver with fiber optic input might be a unit to consider. A bunch of
PBS on 87 but most is in AC-3.