A system and method are provided for determining antenna probabilities for a plurality of sub-areas of a geographic area covered by a plurality of antennas. In this regard, the antenna probabilities may indicate for each of the plurality of sub-areas a probability that in a respective sub-area a field strength of a particular antenna is higher than a field strength of at least one other of the plurality of antennas, and may indicate the probability that a mobile communication terminal, located in the respective sub-area, uses the particular antenna for communicating. The antenna probabilities may be determined based on field strengths. The antenna probabilities for the plurality of sub-areas may be determined based on normal distributions of field strengths. In this regard, expected field strengths for antenna(s) in each sub-area may be calculated. The real field strengths may be measured, such as by use of mobile terminals.