Two antennas are better than one. This allows you to turn diversity on. Diversity allows the antennas to choose between a cleaner signal from the client. As the signal from a client bounces off surfaces it add a little distortion here and there un...
I would also think that you would be connecting at 54mb with no problem. Do a "show dot11 associations all" command in priviledge mode to get more details about your connection. It should show you how fast you're connected.
Remember that the greater distance you move the bridges apart the less the bandwidth. Same as with an AP. Here's a great bridge calcuation tool provided by Cisco that I refer to often: http://www.cisco.com/application/vnd.ms-excel/en/us/guest/prod...