The performance of wireless data communication for fully equipped firemen walking indoors and communicating through textile patch antennas integrated into their clothing is evaluated. The small-scale fading experienced in the building is characterised, then a measurement with a walking test person is performed in different real-life situations. The channel estimations, level crossing rate and bit error rate for the signals of the multi-antenna receiver are studied and compared in different circumstances. The performance of diversity techniques is evaluated and the advantage of applying diversity is validated under different conditions.