Not as easy as it sounds. It's a juggling act between phase shift and
impedance matching. Reference: "The Simplest Phased Array Feed System
... That Works", Roy Lewellen, W7EL, ARRL Antenna Compendium, Vol 2.

http://users.rcn.com/dmurphy.nai/mar...unt/gnvrdf.pdf
I've used this design a fair bit, it works nicely.
Look under "Well, how do I get a directional bearing"