If the current negotiations between the Czech Republic and the U.S.A. come right for the benefit of involvement of the Czech Republic in the missile defense system, the country will become part of a group of several countries that work together with the U.S.A. on construction of the system.
 
In this event, the U.S.A. would locate a ballistic missile defense system sensor in the Czech Republic. In this case, a sensor means an X-band radar that can pinpoint and track a launched attacking long-range ballistic missile in its mid-course ballistic phase.
 
On the recommendation of the Ministry of Defense of the Czech Republic and upon the decision of the State Security Council of July 2007, the radar would be located in the area of the Brdy military grounds, in the vicinity of the village of Míšov in the Pilsen region, on the spot marked 718.8.
 
Most of the time, the radar will be in the passive state (“off”) and is to be activated as soon as American early-warning satellites (sensors located in an Earth orbit) detect an attacking missile having been launched. It will also be regularly in the active state for the purposes of exercises.
 

Right in the picture (100 kB, the JPG format) you can see the coverage of the European radar, which is shown in the green colour as “fine bearing and allocation of a missile interceptor”.
 
So what kind of radar would be located in the Czech Republic? To find out more about this issue, see the section “The Radar in the Brdy Mountains”.