Found this interesting article today... The same comparable performance as a parabolic grid without being a parabolic grid, and more aesthetic looking too for any budding antenna wifi builders out there. The slotted waveguide has achieved most of its success when used in an omnidirectional role. It is the simplest way to get a real 15dBi gain over 360 degrees of beam width. Mount slotted waveguide on it's side to use as vertical polarisation antenna. TREVOR MARSHALL - Slotted Waveguide 802.11b WLAN antennas
