I live in a old house... my cable modem is in the downstairs back room... which doesn't have the second story on top, this means the signal has to go through 2 sets of insulation, 1 wall, and a metal roof to get upstairs (which is where I want to move my computers).
I was hoping to use EoP to link upstairs to the back room, but as we have old wiring I don't think its worth gambling ~$80 on the hardware.
As its not our house, I can't run cat5 either...
guess I'll just have to look for some wifi antennas...