Many , as in Many digital Tv stations/channels are receivable at your location. Install a ANT751 antenna aimed at about 185 degree magnetic compass. Use a simple common 3 way splitter. The coax that is in place to distribute the small dish signals to the locations of the house can be connected to the antenna. Remove all dish hardware and connections. So that just the coaxes with the connectors on the ends of the coaxes are there to connect to the 3 way splitter. You can find the ANT751 and splitter and etc. at Home Depot or Lowes. No you do not need fancy gold plated super high priced wiz bang splitters and hardware. Yes you can use the dish mount. However the dish mount needs to be mounted at a high place of the roof. If the mount is a J mount , most are , the mount can be attached to a eave at the edge of the roof , however it must be up high. It is best to mount the antenna in a manner that the antenna has a good view in all directions. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.