|It should not be that hard to get the computer to connect to the antenna, and you should not be losing the connection, at least not often, once it works, unless something is inadequate.|
Usually one only uses an antenna (dish antenna) if they can't get a high speed DSL or ADSL, or cable, connection where they are - it connects to another (dish) antenna of the ISP's some distance away locally , or to a satellite. Is that your situation? If so, do you connect to a local antenna or to a satellite (e.g. one also for TV)?
What are you using to connect to the antenna? I assume it's not wired directly via a cable to the antenna. Something that was provided with the antenna, or via a regular wireless router or wireless network adapter?
A wireless network internet connection often may not work right away when you first start the computer - you simply have to wait.
In your case you may need to wait longer - for the wireless connection to work, and then for the antenna to connect to the ISP's antenna or the satellite.
e.g. when a friend of mine first boots her laptop, the wireless G connection takes up to 3 to 5 minutes to connect after the desktop has fully loaded - that can vary a bit depending on the brand and model of the wireless adapter, or in her case, the wireless router. The wireless connection then works fine for her most of the time, although occaisionally she needs to re-boot her high speed modem or wireless router after the wireless connection has been lost or has become poor. Wireless N is supposed to be a lot more reliable. Sometimes certain wireless adapters or wireless routers don't work well together, and you must change at least one to another brand or model.
How far away is the antenna from your computer? The farther away it is, the harder it will be to connect to it wirelessly. The wireless signal strength is proportional to the square of the distance from the antenna - e.g. twice was far away, 1/4 the strength. Wireless G has a distance limit (range) of about a hundred meters (300 feet) outside when there are no obstructions - the more obstructions in the way, the more metal and dense things (e.g. concrete) in the way, the less the range. You can buy directional or tiny disk antennas for wireless network adapters and routers that focus the signal more in one direction and yield a stronger signal in that direction, rather than you using the default antenna that broadcasts in all directions.
If you are connecting to a local ISP's antenna, you may need to call them up and have them troubleshoot the connection on your end , or contact their web site or look at t-shooting info on their web site - your antenna may need to be aligned better. There is a max distance you can be from their antenna - if you're nearer the limit, you will likely have connection problems. A friend of my brother's has such a situation - she lives in thecoutry andconnects to an ISP in a nerby town - the ISP cameandchanged something and her connection now works a lot better.
If you are connecting to a satellite, your antenna may need to be aligned with it better. Call the satellite ISP, or contact their web site or look at t-shooting info on their web site.