Mediaconverter for RouterBoard

Hi,

do you know a fiber->copper mediaconverter that can be fit inside a RB outdoor enclosure?

What about using the one of the new 2011 series that supports an SFP module?

http://routerboard.com/RB2011UAS-2HnD-IN

unfortunately I need to attach the fiber to a RB4xx or 7xx series up to a tower. I need N connector and external antenna (and 5GHz band).
I have to use the fiber because the ethernet wont works properly (FM transmitter on tower).