is it possible to have third sat feed

[pspmixer]

is it possible to have a third sat feed from a existing sky dish which all has 2 feeds already (2 dual channel sky boxs)
i want to get another sat feed which can have a sky + hd box (2 more cables) on the other end but wanted to know if it is possible to do so
my other boxs both have two cable (feeds) going to them and work fine
how much and where can i get this from in liverpool if its possible to do

[bj1]

you need to buy a octo lnb and replace it for your quad lnb on your dish this will give you a extra 4 feeds have a look on ebay for octo lnb..... or you can pm me and i will come and fit one for you as i do some aerial work in liverpool quite often.....BJ1