CMk - I would just build it with speaker wire - the thing about the 300 ohm cable is that the wires are separated by about a half inch - not sure what this does - but you could simulate this by separating but holding them at half inch with duct tape/electrical tape. I have no idea what the spearation or 300 ohm bit is about - it might be totally unnecessary for short runs. I'll bet it will sound fine with speaker wire. I've built this twice - once with a fancy wooden frame made out of dowels and molding - then the super fast way to build a stationary one - just put four nails in the wall and wrap the wire around in the square configuration... You live somewhere that doesn't have a Radio Shack??? Don't tell me you don't have Starbucks either?...
Note that the ant design has two variations depending on which part of the spectrum you are trying to pickup... I went for the smaller college radio/NPR version.
Note that the ant design has two variations depending on which part of the spectrum you are trying to pickup... I went for the smaller college radio/NPR version.