This isn't that hard to do. You just need a dish, a suitable power source and point it at the satellite. Because of the, in general, wide area that a satellite is looking down on the transmitter can be anywhere in quite a wide area (even when you are talking about the relatively narrow uplink antenna).
Given that these satellites are geostationary they can be seen from a very wide area on the ground. Back in 2003 Telstar-12 was jammed from a station in Cuba apparently run by Iran (http://www.atimes.com/atimes/Middle_East/EH22Ak03.html) to block transmissions to the Americas and Europe.
Given that these satellites are geostationary they can be seen from a very wide area on the ground. Back in 2003 Telstar-12 was jammed from a station in Cuba apparently run by Iran (http://www.atimes.com/atimes/Middle_East/EH22Ak03.html) to block transmissions to the Americas and Europe.