I added a Hawking antenna to my Linksys modem (replaced one of the 2 antennas), and the signal strength increased by about 15%, which was anough to put me over the edge. Also, it does matter how the antennas are positioned.
My cable modem is on the 2nd floor, and my SB3 is in the basement. To make matters worse, immediately over my SB3 is a steel I beam, a large metal air duct, and various wires and pipes.