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This paper presents experimental results of indoor MIMO wireless channel and channel capacity evaluation for compact PIEA (Planar Inverted "F" Antenna) antenna arrays at the 2.45 GHz frequency band. Linear and square array configurations are evaluated using PIFA antenna elements because of its advantages of low profile and flexible configuration design for compact and portable mobile terminals. Measurements are performed using a VNA with GPIB standard for automatic data acquisition. MIMO channel capacity results are calculated from a large amount of data combining uncorrelated space and frequency measurements, obtaining results that are statistically representative. Antenna array size from 0.1 to 0.8 wavelengths are tested to evaluate the effect of mutual coupling. Results show that the most efficient configurations can provide high capacity for array size as small as 0.3 to 0.4 wavelengths, which is a significant compact array size for portable wireless terminals (about 4 centimeters for the tested frequency). [ABSTRACT FROM AUTHOR]