Reception of the LA signals is going to require a large, 'deep-fringe' antenna or combination of antennas.
The Antennas Direct 91XG plus an Antennacraft Y10713 is an option... A Winegard HD7698P is a single antenna option. Regardless of the exact antenna chosen, expect to need a preamp such as the Antennas Direct CPA-19.
If you have several TVs to connect, you'll find the channel surfing experience easier if you build this as a separate fixed aim system, cabled to the TVs via a separate coax run. Use an A/B switch or a set-top-box accessory tuner.
http://forum.tvfool.com/showthread.php?t=2882