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ummmm....how far do you need to shoot this signal?
there are a few things to consider when buying dish antennae:
1) they are usually sold "tuned" to a specific frequency range and the dish that you have may function with 802.11a (5gHz range)
2) they are usually sold in pairs as part of a point to point wireless link and these can range from 1 to 26 miles (in theory it can go farther but beyond actual "sight" distances alignment can be very difficult).
3) As the beam width is extremely narrow (+/- 5 degrees on both axises), it's use in a wireless LAN (client to AP/router) is severely limited, especially as the beam width is ~1-2 degrees in the <500 feet range.
having said all of that, you will need some sort of wireless aggregation device: a router or access point (for a wireless LAN) or a pair of bridges (or routers/access points capable of a bridging mode) for a point to point solution.
If you could give us a bit more detail as to what you want to set up from a wireless point of view, more specific suggestions can be given.
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