A radiating structure (200, 300, 400) comprising: a radiating layer comprising a first portion of a waveguide channel (202, 304a-304f, 404a-404f), a waveguide layer comprising a second portion of the waveguide channel, and a bottom layer comprising a third portion of the waveguide channel, wherein: the waveguide layer is configured to propagate electromagnetic energy via the waveguide channel, wherein the waveguide channel has a height dimension and a width dimension, wherein the width dimension is greater than the height dimension; and the radiating layer and the bottom layer are coupled to the waveguide layer, wherein: the radiating layer is parallel to the height dimension of the waveguide channel; the radiating layer comprises a plurality of radiating slots (204a-204j, 306a-306f, 406a-406f), wherein each radiating slot: is defined by an angular or curved path, is coupled to the waveguide channel, and has an effective length greater than the height dimension of the waveguide channel, wherein the effective length is measured along the angular or curved path of the slot, wherein a first one of the plurality of radiating slots has a first rotation with respect to the orientation of the waveguide channel, a second one of the plurality of radiating slots has a second rotation with respect to the orientation of the waveguide channel, a third one of the plurality of radiating slots has a third rotation with respect to the orientation of the waveguide channel, and characterized in that the first rotation, the second rotation and the third rotation are different from each other. a radiating layer comprising a first portion of a waveguide channel (202, 304a-304f, 404a-404f), a waveguide layer comprising a second portion of the waveguide channel, and a bottom layer comprising a third portion of the waveguide channel, wherein: the waveguide layer is configured to propagate electromagnetic energy via the waveguide channel, wherein the waveguide channel has a height dimension and a width dimension, wherein the width dimension is greater than the height dimension; and the radiating layer and the bottom layer are coupled to the waveguide layer, wherein: the radiating layer is parallel to the height dimension of the waveguide channel; the radiating layer comprises a plurality of radiating slots (204a-204j, 306a-306f, 406a-406f), wherein each radiating slot: is defined by an angular or curved path, is coupled to the waveguide channel, and has an effective length greater than the height dimension of the waveguide channel, wherein the effective length is measured along the angular or curved path of the slot, the waveguide layer is configured to propagate electromagnetic energy via the waveguide channel, wherein the waveguide channel has a height dimension and a width dimension, wherein the width dimension is greater than the height dimension; and the radiating layer and the bottom layer are coupled to the waveguide layer, the radiating layer is parallel to the height dimension of the waveguide channel; the radiating layer comprises a plurality of radiating slots (204a-204j, 306a-306f, 406a-406f), wherein each radiating slot: is defined by an angular or curved path, is coupled to the waveguide channel, and has an effective length greater than the height dimension of the waveguide channel, wherein the effective length is measured along the angular or curved path of the slot, is defined by an angular or curved path, is coupled to the waveguide channel, and has an effective length greater than the height dimension of the waveguide channel, wherein the effective length is measured along the angular or curved path of the slot,