Wifi Antennas
From Makers Local 256
These have already been created, but not finished. Currently, they need a backplane and a connector attached to them. The theoretical gain is ~22dbi and theoretical beam width is < 10 degrees. Practical gain is unknown.
These antennas have the amazing property of being able to lock onto any signal regardless of polarization.
Materials:
VERY large guage solid copper wire (god only knows how much power you can put into these things)
2" diameter PVC pipe
other various PVC parts
Picture of partially completed antenna with 100 stack of DVDs for comparison:
