Does the antenna come with the RCM6600W kit and/or can it be purchased separately?

The antenna comes with both the Standard and Deluxe kit for the RCM6600W.  You can also purchase it separately.  It is part number 101-1295 and can be found at our online store here http://store.digi.com/index.cfm?currentpage=3&fuseaction=category.display&category_id=639