[TowerTalk] 4 square advice

[cqtestk4xs at aol.com]

I'm starting construction of my wire 4 square for 80 meters.

I know the bigger the diameter is (like having Rohn 25 tower for the radiator) the better the bandwidth.  
I'm using #12 insulated wire, but in an effort to enhance bandwidth I'm planning using two wires joined at the top and at the feedpoint for each element.  To space them  I'm using some old KLM diamond shaped spacers every five feet or so to keep the two wires approximately 5 or 6 inches from each other...running the wires parallel to each other.

Any thoughts as to how helpful this will be in increasing bandwidth?  I have about 45 of these spacers and they're just gathering dust, and they are lightweight, UV resistant and free.  Also, any thoughts as to how this might affect the impedance etc.?

Bill K4XS/KH7XS