Originally Posted by DeafFlyer
Does it mean 180 posts every 180 days or either 180 posts or have been using it 180 days or ?

None of the above
OMNI becomes visible once you have achieved at least 180 posts
AND have been a member for at least 180 days.
Examples:
Member A has 180 posts but has only been a registered member for 179 days - no OMNI access
Member B has been a member for 180 days but only has 179 posts - no OMNI access
Member C has been a member for 180 days
AND has 180 posts - OMNI access
Hope that helps clear things up.