Been using this device for about 2+ years, and when I started was getting about 20/10 mbs (up/down).  It gradually reduced over the months to about 8/2 and I decided to try an external antenna (but not mounted outside).  The devices are behind a 13" brick wall unfortunately, but I know it was capable of 20/1 which is adequte for what I need.  The external antenna did not seem to be any better, so I replaced the two stick antennae provided, and am now getting close to 20 up but only about 1 to 1.5 down.  I have both stick antennae pointing up vertically, and at 90 degrees to the nearest mast.  Any thoughts?