The performance evaluation of a mobile terminal antenna can be done by measurements on test routes or by calculations using measured direction-of-arrival distributions and the measured or calculated radiation pattern of the antenna. Measurements on test routes require a lot of effort with completed prototypes, and, therefore, a reliable calculation-based evaluation method would be useful. In this paper, the results of these two types of evaluation methods are compared for the mean effective gain of six different terminal antennas in four environments at 2.15 GHz. The results of the two evaluation methods coincide well, as the mean and the standard deviation of the difference between the relative received powers are -0.2 dB and 0.8 dB, respectively. No significant difference in the coincidence is found between different environments or antennas.