Vaio TT slow wireless connection

Hi I just got TT 190 1.4 Mhz/64x2 Raid/3 Ram

This computer has Intel wifi 5100 and the connection is between 5 Mbps to 15 Mbps 15 feet from my router (Belkin N1 Vision). If I put the computer just 2 feet from the router the speed increase to 90 Mbps to 140 Mbps. I also have a TZ 180 NR and reach 144 Mbps all around my home (My PS3, Itouch and G1 phone reach 54 Mbps). I called sony support and I went 2 hours trough 3 levels of technicians, they said is kind of normal but I don't think so I had had 5 vaio computers and this is the slowest connection I seen. No new drivers from intel and if you try to re-install the drivers trough partition is not working ether.
Any suggestions?? shall I returned???
One more question is true as the technitian that the Mbps connection is not related with the Internet speed........

 

Something is fishy. My TT180c has 36-48 mbps connected to my linksys G router (which is 54 mbps). I did not get 54 even if I get very close to it. So, it may have something to do with the antenna. Did you look at the properties of 5100? Did you try changing some of the settings to see if it would improve. Did you try comparing these settings to the TZ?

 

Have you tried to install the latest Intel drivers, 12.1.2.1, available here ?

 

It is because the TZ has the 4965 card with 3 antenna and the TT has a 5100 card which only has 2 antenna. Get a 5300 card or a third antenna for better performance.

See here for a comparison:
http://www.anandtech.com/cpuchipsets...spx?i=3356&p=6
http://support.intel.com/network/con...5000/index.htm