I live in a duplex,and want to share my DSL connection with the upper tenant.My first thought would be to try a wireless networking kit for this,as cabling is not an option.Or run a outdoor rated cat5 jumper up there via the exterior.I was thinking about putting the wireless antennas in the windows,as the upper and lower windows are aligned(about 12 feet apart).Would this be an option?Any suggestions would be appreciated.Thanks.