be off the radar

To go ignored, unnoticed, or appreciated; to not be relevant, prominent, or important. Though they've been prolific music-makers for years, their work has largely been off the radar for most listeners until quite recently. Even though homelessness can be seen as one of the largest underlying causes of societal ills, it is sadly just off the government's radar. Unfortunately, many social welfare projects have been off the radar ever since the economy crashed.