Being aperiodic should mean there's no well defined grating lobes. Basically each emitter pair has a different spacing and thus different grating lobe location,

Being aperiodic should mean there's no well defined grating lobes. Basically each emitter pair has a different spacing and thus different grating lobe location, so across the whole array they get smeared out to an even sidelobe level. But yes, wondering what the mainlobe contrast is.. it's also >lambda spacing so the efficiency is probably poor.