I have found a Dell 5520 MiniPCI-E 3G card which I intend to use with my RB411UAHR.
http://www.ebay.com/itm/221941089128
Says this card is supported on the hardware page here:
http://wiki.mikrotik.com/wiki/Supported_Hardware#3G_cards_and_modems
I’m assuming the connectors on this card are u.FL connectors, one marked M (main) and the other A (aux). I’m unsure of the difference between these connectors as far as connecting an antenna, does anyone here know how these connectors work outside a laptop antenna situation?
First of all this is the question for the Dell and not for the Mikrotik forum IMHO, and second, the right question to google, makes miracles…
http://en.community.dell.com/support-forums/network-internet-wireless/f/3324/t/5098615?db=5
enjoy
Praise Jesus