Wireless Antenna connectors D-link to Linksys

I've got a linksys WRT54g and wanted a better signal at the other end
of the house - it was down to 1Mbs and low strength.

I was advised by Wifi-Warehouse to get a D-Link DWL-50AT, and was also
advised that it would be compatible.

Well, it arrived and the connectors are different sizes.

From the D-Link website I've found out that the DWL-50AT has a reverse
SMA connecter, but can't find out what the Linksys uses.

Wifi-warehouse are trying to get that info from Linksys but it is
taking a while, and I just wondered if anyone here know what Linksys
use - I was told that they use "some odd bnc connector"!

Help...

Cheers

SteveB