![]() The bent "legs" might have the purpose of electrically "enlarging" the plane area, but they might also serve as mechanical improvements, making the ground plane more rigid. You don't get that, but something around two times the quad side length in each direction around the driven element should do most of the work – you don't lose that much if you don't have that. ![]() You want an infinitely sized, perfectly conducting ground plane. The metal plane really just has the purpose of acting as a reflector – due to symmetry, the biquad has the same pattern into the "front" and back, and adding a simple metal plane in the right distance from the antenna will make the reflections add up constructively with the "forward" direction, thus adding a 3dB to gain (in theory).
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