I bought that rack from MP3/Wingstuff and have it installed. I haven't had to carry a box of beer yet but a Kuryakyn Classic Tour Bag does fit nicely without interfering with the antenna. Just can't extend (2") the right side of the bag because of the antenna. I suppose you could relocate the antenna to the centre/rear of the rack if you were keen enough for a different look.

The rack clears the antenna by a full inch.

I think the MP3 rack looks great, especially in black on the black bike.

The only thing that didn't come with the rack was fitting instructions, but once you compare the 'bits' with what's on the bike it soon becomes apparent how it goes on. Be aware that the plastic trim that is replaced by the piece with the 2 holes for the mount is held in place by a small screw at the rear....don't try and prise it off.