That is a Snipe 1, you will need a satellite tuner if your TV doesn't have one built in. Snipe 1's were a bit unreliable so if you don't have a tuner see if you can borrow one to try it.
Also if may need a firmware update, a real pain to do on a Snipe 1 and you will need a Windows XP PC to do it as the software you need to do the update won't run on later operating systems.
There should be another cable coming down from the roof with an F connector wich connects to the tuner or TV .
The mounting plate is the same for a Snipe 1, 2 & 3 and you can use the existing cables so might be worth replacing it with a Snipe 3.