Description: A program is proposed to research the applicability of a unique phased array technology, dubbed FlexScan, to S-band and Ku-band communications links between stratospheric balloons and TDRSS satellites. If successful, FlexScan phased array technology will provide high antenna gain with a narrow beam that can be steered up to 60? off broadside from a planar, low cost, low profile package. Compared to fixed, broad-beam antennas, this can be translated to increased communication range, higher data rate, reduced weight, and reduced power consumption. Concept feasibility will be assessed by modeling, prediction of array performance, and the fabrication and test of breadboard demonstration hardware for critical technology components.