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This paper the design of a lightweight and compact patch antenna array with an inclined proximity coupled feed. The antenna array is designed for operation on a small unmanned aircraft system (sUAS) with an ultra-wideband (UWB) radar for remote sensing of soil moisture and snow. To achieve UWB impedance matching, the design utilizes an inclined wide feed and inter-element coupling. A 3-D printed base (polylactic acid) is used to support the feed structure. The antenna array operates over a 2.5 GHz &#x2013; 4.5 GHz frequency (57.2&#x0025; bandwidth) range, and its weight is 112 grams. A prototype <inline-formula> <tex-math notation="LaTeX">$2\times4$ </tex-math></inline-formula> element array is fabricated and tested. The antenna array has an 88.2&#x0025; average radiation efficiency and a 13.2 dBi average realized gain over the desired frequency band with broadside and stable radiation pattern.