Hello - I don't know why, but my two desktops upstairs used to get better reception.  Nothing's changed really.  I have a TP-Link powerline adapter hooked to my Mac downstairs and it gets the full download speed.  I tried to replicate this with two more powerline adapters, but couldn't get them to connect, so my two desktops upstairs get half the speed, which is still good.  I thought I'd try a range extender, hoping that would boost the speed upstairs, but it's not much better than the WiFi card in my desktops.  I hate to return it, but is there something I can try to get better speed?  Thanks for any help.