As you can see from the map above, there are many satellites transmitting television signals to every country in Europe. Listed are all the geastationary satelites that signals can be received from if you are in the east coast of Ireland. Some of the satellites are more powerful than others and require differant minimum sizes of dishes to obtain good picture quality.
The Astra group of satellites (19 degrees east) transmit a very strong signal and so an 80cm dish is adequate for receiving purposes. That would be about the size of the small dish in the picture on the right. If you wanted multi-satellite reception you would need a motorised tracking system - 1.6metre dish would be recommended. This would be somewhere in the middle of the two dishes, sizewise. The big dish on the right is actually used for tranmitting up to the satellites, but that's another story!
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