The footprint of a communications satellite is the ground area that its transponders offer coverage, and determines the satellite dish diameter required to receive each transponder's signal. There is usually a different map for each transponder (or group of transponders), as each may be aimed to cover different areas.

https://en.wikipedia.org/wiki/Footprint_(satellite)

https://www.satbeams.com/footprints

The Atlantic Bird-3 C-band EUMETCast footprint extends into the eastern part of the US at reduced levels and EUMETSAT recommend that a dish size of 3.7 m will be required in most US locations.

http://www.geo-web.org.uk/msg_c_band.php



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Note added at 26 mins (2015-08-16 16:42:56 GMT)
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https://www.satbeams.com/satellites?id=2281

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Note added at 43 mins (2015-08-16 17:00:10 GMT)
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What is a satellite footprint? It is the area of the earth visible to the satellite. Since the ability to accurately view portions of the earth deteriorate as the edge of the footprint is reached, satellite footprints overlap providing coverage for these areas. The best way to visualize a satellite footprint is to view the full disk image from that satellite.

http://www.ssd.noaa.gov/imagery/footprint.html

The area of the Earth covered by the microwave radiation from a satellite dish (transponder) is called the satellites footprint. The size of the footprint depends on the location of the satellite in its orbit, the shape and size of beam produced by its transponder and the distance from the earth. The footprint can be seen as:

The area in which a broadcast signal from a particular satellite can be received
The area on the surface of the earth within a satellite’s transponder (transmitter or sensor) field of view.

http://techbaron.com/what-is-the-meaning-of-a-satellites-foo...