An optically transparent and lightweight stacked filtering patch antenna for conformal and flexible applications is presented. The antenna consists of two layers of patches utilizing optically transparent fluorinated ethylene propylene (FEP) film and polyethylene foam that are stacked for bandwidth enhancement while maintaining a high level of conformability. The antenna is designed for L-band applications and tested for the flat case as well as conformed to a cylinder with a radius of 200 mm, 160 mm, 80 mm, and 40 mm. The antenna has a bandwidth of 16.1% (1.152–1.355 GHz) and the gain varies from 7.4 dBi to 3.6 dBi for different cases of conforming to a cylinder.