Abstract: A patch array microwave antenna comprising spaced sub-arrays each consisting of a patch and at least a pair of parasitic patches fed from the non-radiating edges of the fed patch. In a second embodiment a second pair of parasitic patches fed from the radiating edges are also provided so as to form a five-member cross. Spacings between patches in a group are kept to below .lambda./15, and groups spaced apart by at least double this. Intergroup distances P are kept below 2.lambda., but may be greater than .lambda. if alternate lines of patches are staggered by P/2 so no on-axis diffraction lobes appear in the radiation pattern.